As MiRai said you'll be used to it and sometimes you'll be forced to hit your follow key to stop one or another to run away and mess everything...

But... that behaviour usually happens when mob is moving. So move your tank to the mobs and then hit your IWT. The mobs will be standing still and the mellees will move to the target to do their job.

In my case (I use ISBOXER and a multi steps configuration) I included a 'face target then stop' step to avoid that behaviour. This way, they move to target but on the 3th or 4th step they will stop, face the target and IWT again. I'm pretty happy with this method.