Today was a flight model modding attempt day. 
I found a POH online for the Flight Design CTSL (the actual CT Supralight, not one of the beefier LSA models) and read that the -12 degree flaps position is meant to be used at cruise, to reduce drag and boost speed a few knots!
Tested it out, and unfortunately found that it has no effect on speed in the sim, though it does correctly affect pitch… Turns out the flight_model.cfg lists 0 drag for both 0 degree and -12 degree flaps positions!
Unfortunately my attempts to mod it didn’t result in improvements; I think the flaps drag model just doesn’t properly handle negative flaps right now. ;_;
It’s still a lovely plane and I enjoy flying it, but I could sure use that extra 5 knots boost.
Detail thread on this subject if anyone’s interested: