- User Generated Content - Players to be able to upload models and textures for use in game.
- Exploration - Exploration and discovery should be key gameplay elements.
Is a conquer-the-universe gameplay objective going to be able to create a long lived game? Should it have RPG elements? Should it focus more on trading, economics, or something else?
Maybe a sim-solar-system, with players creating trade routes, discovering and colonising new planets... hmm.
The first Corsair project taught me that it really helps to get gameplay rules correct, before coding starts. :-)