This is a great list, I think you should recreate the points into shorter bullets and post it in the suggestions forum directed to the DEV's

Few Comments. The claiming system works, it goes off who attacks if first so as long as you get the first hit, you get the exp. Even if a 50 comes along and one shots it.

The targeting I am pretty sure is intentional. It gives us the ability to pick our targets and not attack something by mistake that we did not want to. It adds another element to combat in the case of the Moles and gnats as well, if they disappear, why would targeting remain? in real life you would have to franticly look around hoping it does not pop behind you and get your barrings on it again.