For windowed fullscreen, you can set it to a higher resolution without checking the fullscreen option and it shouldn't mess with your other windows. If that wasn't working, it was a bug. I'll test it later today. Or if you just mean you want something that dynamically fits your resolution instead of the couple hardcoded options, that's on the list
For the other planes being more maneuverable, if you're going too fast or too slow you can't turn optimally. Right now all that there is to communicate that is a blackout effect if you're going too fast and some wingtip vortices if you're close to the optimal speed, but I'm still working on communicating that.
Rest is good suggestions, I'll work on them.