A ton of people 'just came up with it' in PMs and posts. So yeah.
I thought of it myself almost as soon as we got force vectors.
It's not exactly the most original idea.
Also, it's extremely neat while fighting with a friend in singleplayer and just as I'm about to get punched while above him (flying due to low gravity) gravity changes to the minimum and I squash him into pieces.
Too bad replays are busted.