EDIT Since this topic became more about getting the Q400 cold and dark and some people might miss the given information I renamed it from 'Q400 FMS off?' to 'Q400 cold and dark!'
I edited the q400.tmd and after making 44 changes I now always have a complete cold and dark cockpit whenever I get into the plane, thanks to the new beta. Nice! The only thing I couldn't get done is to turn of the FMS. Whenever I turn on the batteries all screens etc. are off (PFD, MFD, ED, MCDU, STBY COM, etc.) but the FMS is on right away. Not a problem at all, of course, but it would be nice if I could have that one turned off by default too (by editing the q400.tmd). Since you can actually turn it off this should be possible! If someone could tell me how to get this done I'd be much obliged.