As I said, the explicit non-auto IWT should switch it off. I mean the key you normally use to talk to vendors and quest givers. So you can press that after combat.

Another idea is to add it to "Follow Me in ISB42 - WoW Key Map". Normally that calls only "/follow {FTL} in Quick Setup 42 WoW Macro Set" but you could add another action "Click-to-Move OFF in Quick Setup 42 WoW Macro Set". This way it will be switched off whenever you do follow.