diff --git a/input-keys.c b/input-keys.c
index f73ce397..dfcc8273 100644
--- a/input-keys.c
+++ b/input-keys.c
@@ -220,5 +220,12 @@ input_mouse(struct window_pane *wp, struct mouse_event *m)
 			buf[len++] = m->y + 33;
 		}
 		bufferevent_write(wp->event, buf, len);
+	} else if ((m->b & MOUSE_BUTTON) != MOUSE_2) {
+		if (options_get_number(&wp->window->options, "mode-mouse") &&
+		    window_pane_set_mode(wp, &window_copy_mode) == 0) {
+			window_copy_init_from_pane(wp);
+			if (wp->mode->mouse != NULL)
+				wp->mode->mouse(wp, NULL, m);
+		}
 	}
 }
diff --git a/server-client.c b/server-client.c
index 36bce79b..ef4946a1 100644
--- a/server-client.c
+++ b/server-client.c
@@ -314,7 +314,13 @@ server_client_handle_key(int key, struct mouse_event *mouse, void *data)
 	if (key == KEYC_MOUSE) {
 		if (c->flags & CLIENT_READONLY)
 			return;
-		if (options_get_number(oo, "mouse-select-pane")) {
+		if (options_get_number(oo, "mouse-select-pane") &&
+		    ((!(mouse->b & MOUSE_DRAG) && mouse->b != MOUSE_UP) ||
+		    wp->mode != &window_copy_mode)) {
+			/*
+			 * Allow pane switching in copy mode only by mouse down
+			 * (click).
+			 */
 			window_set_active_at(w, mouse->x, mouse->y);
 			server_redraw_window_borders(w);
 			wp = w->active;
@@ -445,6 +451,7 @@ server_client_reset_state(struct client *c)
 	struct window_pane	*wp = w->active;
 	struct screen		*s = wp->screen;
 	struct options		*oo = &c->session->options;
+	struct options		*wo = &w->options;
 	int			 status, mode;
 
 	tty_region(&c->tty, 0, c->tty.sy - 1);
@@ -460,14 +467,15 @@ server_client_reset_state(struct client *c)
 	 * none.
 	 */
 	mode = s->mode;
-	if (TAILQ_NEXT(TAILQ_FIRST(&w->panes), entry) != NULL &&
-	    options_get_number(oo, "mouse-select-pane") &&
-	    (mode & ALL_MOUSE_MODES) == 0)
-		mode |= MODE_MOUSE_STANDARD;
-
-	if (options_get_number(oo, "mouse-select-window") &&
-	    (mode & ALL_MOUSE_MODES) == 0)
-		mode |= MODE_MOUSE_STANDARD;
+	if ((mode & ALL_MOUSE_MODES) == 0) {
+		if (TAILQ_NEXT(TAILQ_FIRST(&w->panes), entry) != NULL &&
+		    options_get_number(oo, "mouse-select-pane") == 0)
+			mode |= MODE_MOUSE_STANDARD;
+		else if (options_get_number(oo, "mouse-select-window"))
+			mode |= MODE_MOUSE_STANDARD;
+		else if (options_get_number(wo, "mode-mouse"))
+			mode |= MODE_MOUSE_STANDARD;
+	}
 
 	/*
 	 * Set UTF-8 mouse input if required. If the terminal is UTF-8, the
diff --git a/tmux.1 b/tmux.1
index 45292ed9..af6b78e2 100644
--- a/tmux.1
+++ b/tmux.1
@@ -2310,8 +2310,9 @@ contains
 .Op Ic on | off
 .Xc
 Mouse state in modes.
-If on, the mouse may be used to copy a selection by dragging in copy mode, or
-to select an option in choice mode.
+If on, the mouse may be used to enter copy mode and copy a selection by
+dragging, to enter copy mode and scroll with the mouse wheel, or to select an
+option in choice mode.
 .Pp
 .It Xo Ic monitor-activity
 .Op Ic on | off
diff --git a/tmux.h b/tmux.h
index 82bdc296..def69db5 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1081,6 +1081,7 @@ struct mouse_event {
 #define MOUSE_3 2
 #define MOUSE_UP 3
 #define MOUSE_BUTTON 3
+#define MOUSE_DRAG 32
 #define MOUSE_45 64
 	u_int	x;
 	u_int	y;
@@ -1428,6 +1429,7 @@ void	tty_cmd_clearstartofline(struct tty *, const struct tty_ctx *);
 void	tty_cmd_clearstartofscreen(struct tty *, const struct tty_ctx *);
 void	tty_cmd_deletecharacter(struct tty *, const struct tty_ctx *);
 void	tty_cmd_deleteline(struct tty *, const struct tty_ctx *);
+void	tty_cmd_erasecharacter(struct tty *, const struct tty_ctx *);
 void	tty_cmd_insertcharacter(struct tty *, const struct tty_ctx *);
 void	tty_cmd_insertline(struct tty *, const struct tty_ctx *);
 void	tty_cmd_linefeed(struct tty *, const struct tty_ctx *);
diff --git a/window-copy.c b/window-copy.c
index d21e4124..b3879f62 100644
--- a/window-copy.c
+++ b/window-copy.c
@@ -760,11 +760,11 @@ window_copy_key_numeric_prefix(struct window_pane *wp, int key)
 /* ARGSUSED */
 void
 window_copy_mouse(
-    struct window_pane *wp, unused struct session *sess, struct mouse_event *m)
+    struct window_pane *wp, struct session *sess, struct mouse_event *m)
 {
 	struct window_copy_mode_data	*data = wp->modedata;
 	struct screen			*s = &data->screen;
-	u_int				 i;
+	u_int				 i, old_cy;
 
 	if (m->x >= screen_size_x(s))
 		return;
@@ -777,8 +777,11 @@ window_copy_mouse(
 			for (i = 0; i < 5; i++)
 				window_copy_cursor_up(wp, 0);
 		} else if ((m->b & MOUSE_BUTTON) == MOUSE_2) {
+			old_cy = data->cy;
 			for (i = 0; i < 5; i++)
 				window_copy_cursor_down(wp, 0);
+			if (old_cy == data->cy)
+				goto reset_mode;
 		}
 		return;
 	}
@@ -792,15 +795,9 @@ window_copy_mouse(
 			window_copy_update_cursor(wp, m->x, m->y);
 			if (window_copy_update_selection(wp))
 				window_copy_redraw_screen(wp);
-		} else {
-			s->mode &= ~MODE_MOUSE_ANY;
-			s->mode |= MODE_MOUSE_STANDARD;
-			if (sess != NULL) {
-				window_copy_copy_selection(wp);
-				window_pane_reset_mode(wp);
-			}
+			return;
 		}
-		return;
+		goto reset_mode;
 	}
 
 	/* Otherwise if other buttons pressed, start selection and motion. */
@@ -812,6 +809,16 @@ window_copy_mouse(
 		window_copy_start_selection(wp);
 		window_copy_redraw_screen(wp);
 	}
+
+	return;
+
+reset_mode:
+	s->mode &= ~MODE_MOUSE_ANY;
+	s->mode |= MODE_MOUSE_STANDARD;
+	if (sess != NULL) {
+		window_copy_copy_selection(wp);
+		window_pane_reset_mode(wp);
+	}
 }
 
 void