Ok this is easy to fix. I did the same thing when i ran warrior shaman rogue pally priest. I set all characters but my main which was the rogue to the g button on back. So when i was in an instance rogue is stealth i would hit g all toons would break follow allowing my main to move forward. Then when i got on a target to sap i would sap it target another char and charge tank in. So just bind a button thats the same on all chars to make them back one step and it breals follow.