Index: sys/dev/atkbdc/psm.c
===================================================================
--- sys/dev/atkbdc/psm.c
+++ sys/dev/atkbdc/psm.c
@@ -236,6 +236,7 @@
 	int			 softbutton3_x;
 	int			 max_x;
 	int			 max_y;
+	int			 three_finger_drag;
 	int			 natural_scroll;
 } synapticsinfo_t;
 
@@ -572,6 +573,7 @@
 	SYNAPTICS_SYSCTL_SOFTBUTTONS_Y =	SYN_OFFSET(softbuttons_y),
 	SYNAPTICS_SYSCTL_SOFTBUTTON2_X =	SYN_OFFSET(softbutton2_x),
 	SYNAPTICS_SYSCTL_SOFTBUTTON3_X =	SYN_OFFSET(softbutton3_x),
+	SYNAPTICS_SYSCTL_THREE_FINGER_DRAG = 	SYN_OFFSET(three_finger_drag),
 	SYNAPTICS_SYSCTL_NATURAL_SCROLL =	SYN_OFFSET(natural_scroll),
 #define	SYNAPTICS_SYSCTL_LAST	SYNAPTICS_SYSCTL_NATURAL_SCROLL
 };
@@ -3785,6 +3787,7 @@
 		int vscroll_hor_area, vscroll_ver_area;
 		int two_finger_scroll;
 		int max_x, max_y;
+		int three_finger_drag;
 
 		/* Read sysctl. */
 		/* XXX Verify values? */
@@ -3799,7 +3802,7 @@
 		two_finger_scroll = sc->syninfo.two_finger_scroll;
 		max_x = sc->syninfo.max_x;
 		max_y = sc->syninfo.max_y;
-
+		three_finger_drag = sc->syninfo.three_finger_drag;
 		/* Read current absolute position. */
 		x0 = f->x;
 		y0 = f->y;
@@ -3888,8 +3891,8 @@
 				    ~MOUSE_BUTTON1DOWN) | center_button;
 		}
 
-		/* If in tap-hold, add the recorded button. */
-		if (gest->in_taphold)
+		/* If in tap-hold or three fingers, add the recorded button. */
+		if (gest->in_taphold || (nfingers == 3 && three_finger_drag))
 			ms->button |= gest->tap_button;
 
 		/*
@@ -5755,6 +5758,7 @@
 			return (EINVAL);
 		break;
         case SYNAPTICS_SYSCTL_TOUCHPAD_OFF:
+	case SYNAPTICS_SYSCTL_THREE_FINGER_DRAG:
 	case SYNAPTICS_SYSCTL_NATURAL_SCROLL:
 		if (arg < 0 || arg > 1)
 			return (EINVAL);
@@ -6148,6 +6152,14 @@
 	    synaptics_sysctl, "I",
 	    "Turn off touchpad");
 
+	sc->syninfo.three_finger_drag = 0;
+	SYSCTL_ADD_PROC(&sc->syninfo.sysctl_ctx,
+	    SYSCTL_CHILDREN(sc->syninfo.sysctl_tree), OID_AUTO,
+	    "three_finger_drag", CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_ANYBODY,
+	    sc, SYNAPTICS_SYSCTL_THREE_FINGER_DRAG,
+	    synaptics_sysctl, "I",
+	    "Enable dragging with three fingers");
+
 	/* hw.psm.synaptics.natural_scroll. */
 	sc->syninfo.natural_scroll = 0;
 	SYSCTL_ADD_PROC(&sc->syninfo.sysctl_ctx,