When you're farming, corspes often overlap making it very hard or even impossible to target a lootable corpse in the pile. You either waste a lot of time trying to click on the right corpse or just lose loot. So there're two suggestions that may fix this problem:
- Make corpses disappear immediately (or faster) after scavenging/butchering.
- Make all corpses butcherable/scavengeable using loot button.
EDIT: Nevermind the last part. The conditions to butcher a corpse using loot button are less straightforward, not all lootable corpses can be just butchered, so the workaround i provided would make no sense.