Index: sexp.cpp
===================================================================
--- sexp.cpp	(revision 6578)
+++ sexp.cpp	(working copy)
@@ -6113,10 +6113,14 @@
 	if (turn_time)
 	{
 		// set flag
-		bank = bank ? AITTV_IGNORE_BANK : 0;
+		int bankflag = 0;
+		if (bank) 
+		{
+			bankflag = AITTV_IGNORE_BANK;
+		}
 
 		// turn
-		ai_turn_towards_vector(location, objp, flFrametime, float(turn_time)/(1000.0f), NULL, NULL, 0.0f, 0, NULL, (AITTV_VIA_SEXP | bank));
+		ai_turn_towards_vector(location, objp, flFrametime, float(turn_time)/(1000.0f), NULL, NULL, 0.0f, 0, NULL, (AITTV_VIA_SEXP | bankflag));
 
 		// return
 		return;
@@ -6229,7 +6233,7 @@
 	}
 	if (n != -1)
 	{
-		bank = eval_num(n);
+		bank = eval_sexp(n);
 	}
 
 	sexp_set_oswpt_facing(&oswpt1, location, turn_time, bank);
@@ -20519,14 +20523,18 @@
 				return OPF_SHIP_WING_POINT;
 			else if (argnum < 4)
 				return OPF_NUMBER;
+			else if (argnum == 4)
+				return OPF_POSITIVE;
 			else
-				return OPF_POSITIVE;
+				return OPF_BOOL;
 
 		case OP_SET_OBJECT_FACING_OBJECT:
 			if (argnum == 0 || argnum == 1)
 				return OPF_SHIP_WING_POINT;
+			else if (argnum == 2)
+				return OPF_POSITIVE;
 			else
-				return OPF_POSITIVE;
+				return OPF_BOOL;
 
 		case OP_SHIP_MANEUVER:
 			if (argnum == 0)
@@ -24231,7 +24239,7 @@
 		"\t3: The Y coordinate to face.\r\n"
 		"\t4: The Z coordinate to face.\r\n"
 		"\t5: Turn time in milliseconds (optional)\r\n"
-		"\t6: Bank (optional)" },
+		"\t6: Bank (optional, boolean value)" },
 
 	// Goober5000
 	{ OP_SET_OBJECT_FACING_OBJECT, "set-object-facing-object\r\n"
@@ -24240,7 +24248,7 @@
 		"\t1: The name of an object.\r\n"
 		"\t2: The object to face.\r\n"
 		"\t3: Turn time in milliseconds (optional)\r\n"
-		"\t4: Bank (optional)" },
+		"\t4: Bank (optional, boolean value)" },
 
 	// Wanderer
 	{ OP_SHIP_MANEUVER, "ship-maneuver\r\n"