Add adjustable propellers and a function in which you could change the number of blades. Another one is to have more nose cone sizes.
It would be nice to have a large variety of sizes for the propeller blades and an adjustable amount of blades, because I tend to not like using rotators and a combination of parts to make propellers since they can only be powered by VTOL engines and nozzles, and they use more fuel than if they were stock, one-part, and changeable propellers. The nose cones could also use a larger variety of sizes, such a length of down to at least 0.1 and a maximum length, height, and width of at least 15-20 or more. (P.S. I am in need of resizable propellers and I need them to have 6 blades each and have a blade length of at least 2.5 blocks in length.