Make the designing of propeller crafts easier

When trying to make something propeller/rotor powered right now has major bugs, like you cannot have an adjustable pitch blade on a motor, if you do stretch it will stretch out and break majorly.
Somehow either make propellers more stable to make, such as making it less volatile, more thrust produced without having to jank the XML, or making a procedural part like you can do so in SP, but the blade parts maybe being separate?

Maybe even adding gas-powered engines just for another source of thrust, may be fun to have.