I prefer not to grid camp during fights, so I have to get on a nonfaction character (Mickelh139) to fight with mercs in middle of battle, Why? because I am SO tired of constantly clicking "STOP ALL ACTIONS STOP ALL ACTIONS" to keep the mercs back when they are not needed at the moment. It is REALLY annoying, and would be nice if we had a choice to change this setting.
As it is now, the only way to use mercs are grid camping really, if you are in a gang, this would fix that. (Well, hopefully, at least we have a choice whether to grid camp or not)