Both SimpleRockets and Kerbal Space Program are really fun games, but there's one thing that bugs me- it's too hard to rendezvous with something else in orbit, like a space station or something. I feel like a feature to have the spacecraft fly itself into a rendezvous with the target would be amazing. I know it would probably be hard to code, but it would make the game much more fun and accessible to those who find rendezvousing a pain in the butt.