Possible setting -- "Attack downed characters unless engaged"

One quirky thing I've noticed is that enemies will ignore the two people bashing on their skulls and ALWAYS attack the guy who's down. Is it possible to have a setting where they will attack the downed guy only if nobody else is engaging them in combat? Right now it's all/never but I feel like if they have a chance, they WOULD make sure a downed character stays down.

Edit: Apologies if this has been mentioned, I scrolled back a couple months and didn't see anything like it.