For some reason, the gravity mechanic described here makes me think back to Destroy All Humans, and the psychokinesis power. God, I want to play that game again now. That's how such a power should be implemented. I remember bouncing enemies off every solid surface I could find, or if I was outside, flinging them high into the air before blasting them with the desintegrator ray to see if I could vapourise them before they hit the ground. Ah, good times.
Oh, and the time I beat a government agent to death with a cow. That was fun too.