Yep sounds like the problem isnt that its targettable, but that its considered an NPC and gets targetted with F8. If it was made to be a pet or targetted with the nearest PC from F7 it would solve most of the complaints.
And as someone who has a tank as a main, I know just how annoying it is trying to target mobs in a raid. Its already bad enough when you are facing a mob 3 feet in front of you and F8 targets one 50 feet behind it, or one 2 feet behind you that you didnt see. And having things like chests around that come up on F8 instead of mobs was always annoying, especially when you hit em by mistake and set off a trap
