Friendly fire incidents (walking in front of my scope while trying to snipe somone/something also walking right in front of me during close quarters combat);
Command mishaps (getting in the way of doors etc. right while I'm about to click on them);
Looting annoyance (sometimes if I want to loot things from a body quickly I'll just tap x a few times, but they will get in the way of the crosshairs and it will end up making them loot EVERYTHING from the corpse).
There REALLY needs to be a distance command integrated.