Upgradeable Outposts
The current Outposts are just the beginning to world domination. They should be upgradeable, both internally (services etc.) and externally (defenses). Likewise, the conquerable Stations as well as Outposts should have a degradeable state, so that you can gradually disable station functions during a siege which need to be rebuilt from a destroyed state or repaired from a disabled state.

Skill Training - Queue or Dual training
Enabling players to either queue so that training takes the next skill level or starts training another skill up another level. Dual training enables you to have a primary long-term skill in training with a secondary short-term skill sharing the training time. After the secondary skill level has trained, the primary skill trains at 100% again.