It used to be this way ...

I don't know why they took it out. You can keep it so that moving cancels the spell but getting that "You can't cast while moving" message, or having to stop and wait on the server delay is unnerving.

So yes. Please make it so that when you press a spell whilst running the character stops and turns to the mob.

(I know about the face mob button, but I use a gamepad yo! Still seems silly for it to exist..)