That sounds like a great way for someone to set that toggle on, forget and then get really frustrated that their fleet doesn't work anymore.
Hmm. Same as do not build I would say. But I will herd these ships away from the battle in their little pen with hold fire and do not move after the unload command.And if the battle gets a bit hectic make sure when I re-select the fleet to deselect these again and again.
Or just let them be fodder.
Edit: With the latest update. I can just swap the ships around now.