Most people have probably played mario party or some game like it, where there is a minigame where people try to bump each other off of a platform or something. I was thinking about it, and it would be hard to do, but not impossible to copy this technology into starcraft. You would have to use a grid system that found which direction an enemy was when he hit you and how fast they were going, which would take a few triggers, than send the unit off in the other direction based upon the speed. This could be a fun minigame of sorts.
Perhaps this should be in "ideas".
I think that a complicated grid system would be too much work for such a simple game.
What you could do is detect whenever a player gets attacked, then make them lose control (e.g. give their unit to a neutral player) for a short while...
It'd be pretty hard.
You could try using the powerup glitch to give the effect that you're moving over people. Use DT's as boundaries, and if you cross them, you're killed or something.
A simplified version of that minigame could be made by creating powerups where an unit is placed when you hit it. That would make it move.
Maybe that with tux's firing system. It could be a good idea.
I made something in ideas...