Nice.
Although I haven't noticed the game skipping frames when trying to loot a pile of corpses. Rather when there is a big pile of corpses and I shoot another enemy with the shotgun (since it makes many hits in a row for each shot, as if it's a burst weapon, and calculates hit chance, damage etc for each bullet). The problem with looting was only in taht it was impossible to search other corpses in a pile, and you would almost always search the same (usually, empty) corpse and could not reach the other ones because if this. (preventing searching the empty ones should help with this, although enemy weapons would still cause problems here. So maybe enemies on the Arena should be special and not drop weapons at all, or some other workaround must be invented).
Also, i think in Fallout 2 there was a similar problem (when corpses fell on each other it was hard to loot the corpse you need, so there was a workaround for this in the form of two small buttons with arrows under the corpse's "portrait" in the inventory, which allowed to switch between the corpses in the pile, if they were lying on the same hex. But then again, it only worked nice for non-combat situations, or during a pause in the turn-based combat mode. It won't work well for the continuous real-time onslaught with no pause in the battle).