Quote Originally Posted by Lost-Ninja
Main issue I have with it is if I select a target then attack as it goes out of range, my alt will carry on trying to attack that one even if it never comes back in range ignoring all other mobs.

I'll give the assist macro a try.
because that macro is made to keep the target untill its dead, it is good when you tank and few targets but want only one to be dps'ed at the time.