Hi there and Merry Christmas.
CH yoke has been detected by FG,. For the mixture lever you may need to edit some assignation (axis) number to your joystick.xml file that FG is using to control your model by default. However I don't recommend you to assign a lever to a mixture function, neither to the prop pitch, because if by mistake you touch it a little, just because is so close to the throttle lever, you'll enter into panic situations, like engine pan or engine failed .
For accurate and precise tuning I recommend you the using of the keyboard Mixture = Shift M, or just m, for propeller pitch if I recall correctly is P shift but not sure at all.
I own a CH Eclipse yoke, in case you have the CH standard yoke that provides less number of buttons then I'll recommend you to edit the code of the joystick.xml detected by FG.
The trick is to make button economy. So, on a certain case I have assigned breaking system (differential brakes, left and right) to the same button that in commands landing gear down.
In such way we are able to use landing gear down before landing and brakes once on the track, with only one button.Sure, you'll need the the use of
flaps for take off and landings. Not at full position, that can crash you. Just follow the medium position rule for take off, and the medium position +1 for landing.
If flying a propeller, once on the flaps setting profile, you'll notice better start rolling, less drag (less engine needed) and better drive for take off.
If you are on a landing profile Medium +1, then you'll find better control on the speed, so your aircraft will need such +1 position in order to reduce the dive speed and potential energy. If propeller, the speed is control on flaps profile set with throttle engine corrections.
If airliners, flaps profile will depend (or not*) on aircraft handling operations book. Where Weight- speed- flaps profile. is needed. To be notice that there is no such speed correction by throttle, speed must be constant, but the correction is made by pilot stick column. Instead of adjusting throttle that implicates lag, projection. Over pitching, stacking and ballooning are result of that.
* (or not) Because In many old aircraft, like 727, full flaps will follow a crash,. Use medium +1 rule and check if your engine is doing okay to maintain the safe approach speed with good pitch angle, at normal descend rate.
However using autopilot alt and speed on low level flight in combination with the HUD will give you a good reference ( before attempting the approach) in order to know what are you flying and what other fine tuning your aircraft needs to satisfy best performance with control.
http://mpmap02.flightgear.org/v3/ is a good place to watch where are you flying in.
29.92