Glass fuselage would be really cool. So we can make more realistic cockpits. Or a glass paint option that allows you to make a certain part look like its made of glass. And bendable fuselages would help alot with building. Making a cylinder in simpleplanes now takes alot of time and work to do and you need alot of parts. If only you could just bend a fuselage block in a cylinder shape it'd be so much easier and also it would reduce lag, especially for mobile users.