Despite assuming that it ist two sepearate builts, I really would like to see something like we have in CLoD, where you could escape your mission, get to controls interface and after adjusting things you jump right back into your stopped game 3d engine.
I suppose you have to do a reload of controls configs and make sure that you have a consitsent point to return to.
Surely you will have to wait until 3d engine ist started again. But that a lesser problem than jumping out of mission, get to basic manue, controls and after adjusting things go back to mission.