When I did this in the new GECK it seemed to do absolutely nothing. Objects remain firmly in the air and don't seem to want to drop at all.
It was even usable to clutter up a cell with trash on the floor by dropping cans/bottles/human skulls from a height and having them bounce off and around. Is the feature deliberately gone or was it a mistake/Just me?
Hmm, now I'm selecting the object (Milk bottle) and running the sim, nothing happens until I click the render window and the bottle just appears on the ground on it's side and when I move it, it occasionally jerks slightly.
Hardly the smooth physics of past versions.