Why not add inflatable space habitats and inflatable heatshields? They could be procedural like everything else.
That along with the ability to change the Oxidizer/fuel ratio and see the effects of stoichiometric combustion in game.
A few other ideas: Caves and procedural points of interest on every body. Make the career almost entirely procedural. Start in a procedural system on a procedural habitable planet, to explore your procedural system.
Make checkpoints procedural. Make EVERYTHING PROCEDURAL EXCEPT THE CAREER TECH TREE PROGRESS.
Give us parts that can generate TP so players can compare theirs to their friends.
Make astronauts become veterans/get promoted for every number of missions they do. You could have different unlocks for each droid, like resistance to damage or the ability to jump higher, maybe a faster jetpack? Who knows!
More space capsules would be pretty great too, you could even just make the Patriot capsule a style of the space capsules, same with the vroz modules. Then you could incorporate more capsules into the game.
So far the biggest limiting factor for me, is the capsules max radius or 2.5-3M when Artemis & even Apollo were bigger than that diameter by almost an entire meter!
Actually there are decaying orbits! Sort of
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Atmospheric effects can occur as far out as at least 600 km from Droo that I know of (never seen any beyond 2000 km of Droo but exactly where that line is I dunno). If you actually stick with a craft in a low orbit (100 to 200 kilometers around Droo) for 3 or 4 orbits (and DO NOT time warp) you will notice your perigee/apogee decrease a kilometer or 2! And it is the atmosphere that causes this phenomena (because it doesn’t happen around Luna or Brigo that don’t have an atmosphere).
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However you won’t see atmospheric decay (or any atmospheric effects) if you are not actively with that craft. There’s a very good reason for this: if you have 30 or 40 craft orbiting Droo as I often do, having to “station keep” all them would become a tedious and time consuming task! Especially when you don’t have a staff of 20 people and its just you doing all the work.