diff --git a/arguments.c b/arguments.c
index f7b6cbe1..026272af 100644
--- a/arguments.c
+++ b/arguments.c
@@ -37,6 +37,7 @@ TAILQ_HEAD(args_values, args_value);
 struct args_entry {
 	u_char			 flag;
 	struct args_values	 values;
+	u_int			 count;
 	RB_ENTRY(args_entry)	 entry;
 };
 
@@ -173,6 +174,7 @@ args_print(struct args *args)
 	size_t		 	 len;
 	char			*buf;
 	int			 i;
+	u_int			 j;
 	struct args_entry	*entry;
 	struct args_value	*value;
 
@@ -186,7 +188,8 @@ args_print(struct args *args)
 
 		if (*buf == '\0')
 			args_print_add(&buf, &len, "-");
-		args_print_add(&buf, &len, "%c", entry->flag);
+		for (j = 0; j < entry->count; j++)
+			args_print_add(&buf, &len, "%c", entry->flag);
 	}
 
 	/* Then the flags with arguments. */
@@ -243,7 +246,12 @@ args_escape(const char *s)
 int
 args_has(struct args *args, u_char ch)
 {
-	return (args_find(args, ch) != NULL);
+	struct args_entry	*entry;
+
+	entry = args_find(args, ch);
+	if (entry == NULL)
+		return (0);
+	return (entry->count);
 }
 
 /* Set argument value in the arguments tree. */
@@ -257,9 +265,11 @@ args_set(struct args *args, u_char ch, const char *s)
 	if (entry == NULL) {
 		entry = xcalloc(1, sizeof *entry);
 		entry->flag = ch;
+		entry->count = 1;
 		TAILQ_INIT(&entry->values);
 		RB_INSERT(args_tree, &args->tree, entry);
-	}
+	} else
+		entry->count++;
 
 	if (s != NULL) {
 		value = xcalloc(1, sizeof *value);
diff --git a/cmd-send-keys.c b/cmd-send-keys.c
index fd1c1ab9..9ed50d3d 100644
--- a/cmd-send-keys.c
+++ b/cmd-send-keys.c
@@ -33,8 +33,8 @@ const struct cmd_entry cmd_send_keys_entry = {
 	.name = "send-keys",
 	.alias = "send",
 
-	.args = { "lXRMN:t:", 0, -1 },
-	.usage = "[-lXRM] [-N repeat-count] " CMD_TARGET_PANE_USAGE " key ...",
+	.args = { "HlXRMN:t:", 0, -1 },
+	.usage = "[-HlXRM] [-N repeat-count] " CMD_TARGET_PANE_USAGE " key ...",
 
 	.target = { 't', CMD_FIND_PANE, 0 },
 
@@ -56,9 +56,9 @@ const struct cmd_entry cmd_send_prefix_entry = {
 };
 
 static struct cmdq_item *
-cmd_send_keys_inject(struct client *c, struct cmd_find_state *fs,
-    struct cmdq_item *item, key_code key)
+cmd_send_keys_inject_key(struct client *c, struct cmdq_item *item, key_code key)
 {
+	struct cmd_find_state		*fs = &item->target;
 	struct window_mode_entry	*wme;
 	struct key_table		*table;
 	struct key_binding		*bd;
@@ -81,6 +81,44 @@ cmd_send_keys_inject(struct client *c, struct cmd_find_state *fs,
 	return (item);
 }
 
+static struct cmdq_item *
+cmd_send_keys_inject_string(struct client *c, struct cmdq_item *item,
+    struct args *args, int i)
+{
+	const char		*s = args->argv[i];
+	struct utf8_data	*ud, *uc;
+	wchar_t			 wc;
+	key_code		 key;
+	char			*endptr;
+	long			 n;
+	int			 literal;
+
+	if (args_has(args, 'H')) {
+		n = strtol(s, &endptr, 16);
+		if (*s =='\0' || n < 0 || n > 0xff || *endptr != '\0')
+			return (item);
+		return (cmd_send_keys_inject_key(c, item, KEYC_LITERAL|n));
+	}
+
+	literal = args_has(args, 'l');
+	if (!literal) {
+		key = key_string_lookup_string(s);
+		if (key != KEYC_NONE && key != KEYC_UNKNOWN)
+			return (cmd_send_keys_inject_key(c, item, key));
+		literal = 1;
+	}
+	if (literal) {
+		ud = utf8_fromcstr(s);
+		for (uc = ud; uc->size != 0; uc++) {
+			if (utf8_combine(uc, &wc) != UTF8_DONE)
+				continue;
+			item = cmd_send_keys_inject_key(c, item, wc);
+			}
+		free(ud);
+	}
+	return (item);
+}
+
 static enum cmd_retval
 cmd_send_keys_exec(struct cmd *self, struct cmdq_item *item)
 {
@@ -90,11 +128,8 @@ cmd_send_keys_exec(struct cmd *self, struct cmdq_item *item)
 	struct session			*s = item->target.s;
 	struct winlink			*wl = item->target.wl;
 	struct mouse_event		*m = &item->shared->mouse;
-	struct cmd_find_state		*fs = &item->target;
 	struct window_mode_entry	*wme = TAILQ_FIRST(&wp->modes);
-	struct utf8_data		*ud, *uc;
-	wchar_t				 wc;
-	int				 i, literal;
+	int				 i;
 	key_code			 key;
 	u_int				 np = 1;
 	char				*cause = NULL;
@@ -141,7 +176,7 @@ cmd_send_keys_exec(struct cmd *self, struct cmdq_item *item)
 			key = options_get_number(s->options, "prefix2");
 		else
 			key = options_get_number(s->options, "prefix");
-		cmd_send_keys_inject(c, fs, item, key);
+		cmd_send_keys_inject_key(c, item, key);
 		return (CMD_RETURN_NORMAL);
 	}
 
@@ -151,28 +186,8 @@ cmd_send_keys_exec(struct cmd *self, struct cmdq_item *item)
 	}
 
 	for (; np != 0; np--) {
-		for (i = 0; i < args->argc; i++) {
-			literal = args_has(args, 'l');
-			if (!literal) {
-				key = key_string_lookup_string(args->argv[i]);
-				if (key != KEYC_NONE && key != KEYC_UNKNOWN) {
-					item = cmd_send_keys_inject(c, fs, item,
-					    key);
-				} else
-					literal = 1;
-			}
-			if (literal) {
-				ud = utf8_fromcstr(args->argv[i]);
-				for (uc = ud; uc->size != 0; uc++) {
-					if (utf8_combine(uc, &wc) != UTF8_DONE)
-						continue;
-					item = cmd_send_keys_inject(c, fs, item,
-					    wc);
-				}
-				free(ud);
-			}
-		}
-
+		for (i = 0; i < args->argc; i++)
+			item = cmd_send_keys_inject_string(c, item, args, i);
 	}
 
 	return (CMD_RETURN_NORMAL);
diff --git a/format.c b/format.c
index 8d2d8db8..eb7a9e53 100644
--- a/format.c
+++ b/format.c
@@ -2317,6 +2317,8 @@ format_defaults_pane(struct format_tree *ft, struct window_pane *wp)
 	    !!(wp->base.mode & MODE_KKEYPAD));
 	format_add(ft, "wrap_flag", "%d",
 	    !!(wp->base.mode & MODE_WRAP));
+	format_add(ft, "origin_flag", "%d",
+	    !!(wp->base.mode & MODE_ORIGIN));
 
 	format_add(ft, "mouse_any_flag", "%d",
 	    !!(wp->base.mode & ALL_MOUSE_MODES));
@@ -2326,6 +2328,10 @@ format_defaults_pane(struct format_tree *ft, struct window_pane *wp)
 	    !!(wp->base.mode & MODE_MOUSE_BUTTON));
 	format_add(ft, "mouse_all_flag", "%d",
 	    !!(wp->base.mode & MODE_MOUSE_ALL));
+	format_add(ft, "mouse_utf8_flag", "%d",
+	    !!(wp->base.mode & MODE_MOUSE_UTF8));
+	format_add(ft, "mouse_sgr_flag", "%d",
+	    !!(wp->base.mode & MODE_MOUSE_SGR));
 
 	format_add_cb(ft, "pane_tabs", format_cb_pane_tabs);
 }
diff --git a/input-keys.c b/input-keys.c
index f0a38c09..9e47a553 100644
--- a/input-keys.c
+++ b/input-keys.c
@@ -172,6 +172,13 @@ input_key(struct window_pane *wp, key_code key, struct mouse_event *m)
 		return;
 	}
 
+	/* Literal keys go as themselves (can't be more than eight bits). */
+	if (key & KEYC_LITERAL) {
+		ud.data[0] = (u_char)key;
+		bufferevent_write(wp->event, &ud.data[0], 1);
+		return;
+	}
+
 	/*
 	 * If this is a normal 7-bit key, just send it, with a leading escape
 	 * if necessary. If it is a UTF-8 key, split it and send it.
diff --git a/key-string.c b/key-string.c
index 8442727d..a1ef4f51 100644
--- a/key-string.c
+++ b/key-string.c
@@ -284,6 +284,12 @@ key_string_lookup_key(key_code key)
 		return (out);
 	}
 
+	/* Literal keys are themselves. */
+	if (key & KEYC_LITERAL) {
+		snprintf(out, sizeof out, "%c", (int)(key & 0xff));
+		return (out);
+	}
+
 	/*
 	 * Special case: display C-@ as C-Space. Could do this below in
 	 * the (key >= 0 && key <= 32), but this way we let it be found
diff --git a/tmux.1 b/tmux.1
index 20edd876..bb978655 100644
--- a/tmux.1
+++ b/tmux.1
@@ -2627,7 +2627,7 @@ With
 only
 .Ar key-table .
 .It Xo Ic send-keys
-.Op Fl lMRX
+.Op Fl HlMRX
 .Op Fl N Ar repeat-count
 .Op Fl t Ar target-pane
 .Ar key Ar ...
@@ -2642,10 +2642,16 @@ or
 .Ql NPage )
 to send; if the string is not recognised as a key, it is sent as a series of
 characters.
+All arguments are sent sequentially from first to last.
+.Pp
 The
 .Fl l
-flag disables key name lookup and sends the keys literally.
-All arguments are sent sequentially from first to last.
+flag disables key name lookup and processes the keys as literal UTF-8
+characters.
+The
+.Fl H
+flag expects each key to be a hexadecimal number for an ASCII character.
+.Pp
 The
 .Fl R
 flag causes the terminal state to be reset.
@@ -4185,11 +4191,14 @@ The following variables are available, where appropriate:
 .It Li "mouse_all_flag" Ta "" Ta "Pane mouse all flag"
 .It Li "mouse_any_flag" Ta "" Ta "Pane mouse any flag"
 .It Li "mouse_button_flag" Ta "" Ta "Pane mouse button flag"
+.It Li "mouse_line" Ta "" Ta "Line under mouse, if any"
+.It Li "mouse_sgr_flag" Ta "" Ta "Pane mouse SGR flag"
 .It Li "mouse_standard_flag" Ta "" Ta "Pane mouse standard flag"
+.It Li "mouse_utf8_flag" Ta "" Ta "Pane mouse UTF-8 flag"
+.It Li "mouse_word" Ta "" Ta "Word under mouse, if any"
 .It Li "mouse_x" Ta "" Ta "Mouse X position, if any"
 .It Li "mouse_y" Ta "" Ta "Mouse Y position, if any"
-.It Li "mouse_word" Ta "" Ta "Word under mouse, if any"
-.It Li "mouse_line" Ta "" Ta "Line under mouse, if any"
+.It Li "origin_flag" Ta "" Ta "Pane origin flag"
 .It Li "pane_active" Ta "" Ta "1 if active pane"
 .It Li "pane_at_bottom" Ta "" Ta "1 if pane is at the bottom of window"
 .It Li "pane_at_left" Ta "" Ta "1 if pane is at the left of window"
diff --git a/tmux.h b/tmux.h
index edc6de1f..4efdd7cb 100644
--- a/tmux.h
+++ b/tmux.h
@@ -113,9 +113,10 @@ struct winlink;
 #define KEYC_CTRL 0x400000000000ULL
 #define KEYC_SHIFT 0x800000000000ULL
 #define KEYC_XTERM 0x1000000000000ULL
+#define KEYC_LITERAL 0x2000000000000ULL
 
 /* Mask to obtain key w/o modifiers. */
-#define KEYC_MASK_MOD (KEYC_ESCAPE|KEYC_CTRL|KEYC_SHIFT|KEYC_XTERM)
+#define KEYC_MASK_MOD (KEYC_ESCAPE|KEYC_CTRL|KEYC_SHIFT|KEYC_XTERM|KEYC_LITERAL)
 #define KEYC_MASK_KEY (~KEYC_MASK_MOD)
 
 /* Is this a mouse key? */