Make it so that you can't run through team mates. I have begun to notice several instances where I am standing still to avoid enemy blasts and gather whats going on in the match and a team mate runs through me and traps me.
I have also seen issues where enemies run through me and we clip on each others bomb and its a clipped/assisted kill. Can't go left right up or down just stuck on that bomb/column.
This would not only do nothing to stop team-kills, but it would also frustrate players as they get in each other's way and get killed by a friendly/hostile bomb because this one guy wouldn't let you get through him. If anything, this would cause griefing and frustration. Sorry, this is a bad idea.