How bout VCAB... (i'm making this up) Virtual Cabin which you can move about the cabin with wasd keys, more like a first person shooter. In this mode you can eat, sleep, conduct experiments etc. And you have to literally go to the airlock to go EVA, or you have togo to the flight deck to control the space craft. Give you something to do on those long trips
Is that possible? Like hot key CTRL + SHIFT + F8 in VC view? Model the interior of the shuttle, iss, DG, etc. do all that coding, programming, and complicated stuff to make wasd move your astronaut and have proper zero G movement. Hotkey E to perform an action. Example: When you look at something interactable it glows light green, press E and a progress bar comes up showing how far the astronaut is into that operation. sleeping interactions can speed up time, Ex: you want to sleep for a day, choose that option and the simulation fast forwards a day. Have it in multiplayer and hang out in the ISS with a buddy or two! sounds like fun to me!