In many FPS multiplayer games, when you kill someone together with someone else, you get assist points, for example the first one who starts shooting gets 5 points, the helper gets 2. Would this be doable for Stack Exchange, where when you edit a question or answer, you get a small percentage of the score the original author of the answerer gets.
I can only see one problem with this, and that is the amount of improvement the edit made. For example, someone who added actual information to an answer instead of making his own, cluttering up the page more, should get more rep then someone just fixing some language errors.