For the push it is already a very good way to break down cades but if it was a little stronger I don't see why we shouldn't try and see how it affects the game. There are several barricades that require several skilled players to open, and with the lack of skilled players a stronger pull/push might be good. The nade debuff would be very nice, especially if you are the last zombie alive, a 30 second nade really ruins any chance you had at tagging someone.