I see how this would be cool but it would take a while to make and strays away from the point of the game. It is a SpaceFLIGHT Simulator, not a planet walk simulator. Also, SFS is a 2D game, but astronauts and doing a spacewalk would force the game to be in 3D. To add in astronauts you would need to
Create planet landscapes with their own customizable textures
Create astronaut textures
Create a movement system, with controls and animations
Add much more clutter to the UI
It just doesn't make sense to add in a spacewalk/planet walk system. Also just adding in astronauts for the sensation of someone flying a rocket also has no serious point as of right now.
I Fully understand, its still by far the best app I've seen. I truly enjoy it as it is, I've spent a lot of hours building and touring, and plan to spend a lot more time, thanks to Stefo Mai Morojna. Job well done !