I see it as a playstyle question. Depending on how you play, you currently have to decide between economic or military for the command slot. This choice really can't be balanced because (for most people) depending on how you play you are going to choose economic or military and just build that one for every game.
So you'd make it an "and"?
[Military or Logistics] and Economic?
To clarify I was talking roles, perhaps combat/non-combat would be better. Military and Logistics stations are combat, Economic are non-combat. In that sense, yes, I'd like the combat and non-combat to have their own 'slots' because how do you balance that?
Is the current situation unbalanced? Yes, but every person is going to find it unbalanced in a different way because it's like comparing apples and oranges so giving each system a combat and a non-combat slot is my suggestion as each slot can be balanced separately.
If we're doing Modular Command Stations, I think we should go all the way. Give a couple of slots, more on higher tier stations. Interior system? Slap some resource or energy generation modules on there with a logistics "Speed up" module. In a front line system, you might put in a "Slow down" module, a anti-cloak module, and a weapon module (translocator, or maybe long range missiles, or drone spawner, or something). Link the module unlocks to other things - The speed-up/slow-down modules could come with the Zenith TimeSpace Manipulator, or the anti-cloak module with the Decloaker.
Severely restricting what can go on the station takes all the fun of customization away, while just adding complication (and making min-max playstyles easier).
As an alternative, someone also suggested buffing the Econ stations by letting them increase the max resource bank size. For long, slow players like me, that would be a good reason to use them. Of course, if there were a +bank module...
Except that modular command stations were shot down last time they came up so they are probably a no-go. That may change for the expansion pack but their has been no comments from the devs on it yet.
Keep in mind that everything has to fit into the game. As cool as a lot of the ideas being thrown around are, a lot don't fit and a lot are not possible within the game engine.
Hence my suggestion, it involves creating one new unit with no new mechanics so it could be done pretty easily I think,
Note I am not part of arcen, I don't actually know where the line between possible and not possible is beyond what the Devs have posted in the forum before.
D.