As a quality of life improvement, it would be really great if I could see what the current in-game "world time" is from the main menu, without having to actually be in-flight to see it.
Also, in the "Resume Flight" menu, it would be nice if the vehicle stats could also display the time until the next event (SOI transition, planned burn, etc) especially for those long-duration missions, so I can tell at a glance what the next craft I need to jump into is. You can see it on the map view when in flight, but when you have a bunch of vehicles and some of them are interplanetary, it gets hard to manage them all.