i am a bit confused as to what you are trying to do.

if you are trying to auto loot a corpse, there is a checkbox for this.

if you are trying to get a keyboard command for it, i'm not sure it exists. if so, someone here might be able to help.

if you want just one character to do the looting, and assuming you have a keyboard macro to loot, just bind that key and only have that clone utilize it.

does that help?