I think it would be awesome if the targeting options (‘Classic’ and Non-‘Classic’) were character specific. I think this would be useful for people that have ranged skills bound to their left click, as often your character will stop running and start shooting/casting at a target that they are unable to hit if you mouse over a target while running. In this case, Classic Targeting would be preferable. However, Classic Targeting is not necessary for melee skills and for those that use “Move To” on left click.
I know one option is to switch the targeting mode when switching characters. Another option is to bind Force Move to another key - which I have done - but I hope this feature is within the realm of possibility.