Yeah movement key is the best way, I dual box pom-pyro mages ATM and I have KeyClone pass "s" so before I cast I tap "s" real quick to stop the follow. It sucks because it adds a half second before you can start first fireball. Also if lead toon is at max range the back one won't be in range because of /follow distance. Makes me think sometimes to take 1 less point in range for lead toon =)