Here is a random list of unclearly documented parameters

- wing_winglets_flag. Said to be a “legacy FSX parameter not used in the modern flight model” so why is it documented to be required then?
- wing_pos_apex_lon. Said to be “currently not used in Microsoft Flight Simulator. Instead you should be using the aero_center_lift parameter”, so why is it documented then? Will it become used at some stage? Wouldn’t it be better to choose a different name at that stage? Otherwise, if somebody has some bogus value here that doesn’t matter at the moment as it isn’t used, if it becomes used, that will cause a problem.
- wing_pos_apex_vert. Is that used then, or is it like wing_pos_apex_lon?
- wing_sweep. Presumably this is the average for leading and trailing edge?
- htail_area. This is “area of the static part of the horizontal stabilizer (not counting the elevator area)”, so with an all-moving tailplane, should it be zero? But the Asobo F/A-18 has it at 120 ft^2, and the elevator area at 100 ft^2. Measuring from an unofficial drawing, the area of one side of the tailplane is 64 ft^2, so the total area would be 128 ft^2.

Etc. Just reading the documentation carefully it is not hard to come up with more questions.