Think we've all actually wanted this but never really known we do!
Basically make your WASD override controls input by auto as long as they're being pressed without taking auto off.
So you will keep auto on and when you let go of the keys, auto takes back over. This would help with semi-active play (auto whilst watching) for repositioning your char without needing to take auto off. I'd suggest that abilities still fire off when appropriate though.
Also key bind to activate and de-activate auto would be nice too!