For the editor
I think the rotation increments should be reduced to 45* instead of 90, so that non modders and mobile users can take advantage of the ability.
The maximum prop count should also be increased to 9, because there are numerous planes that use 7-9 blades (An70, Propfan, etc.)
The retractable landing gears should also be customizable, like:
A. Length
B. Wheel size
C. Wheel count (yup the N22B Nomad uses a single wheel nose gear)
HELICOPTER BLADES and GYROSCOPES

Sandbox
I think there should be an exclusive mobile-only island that is as large as Snowstone but is a desert island. I also think that the mobile SP should be optimized.
Activation groups should be increased (again) to 12, so that there are more possibilities.