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Huh, I thought I voted 'other'. :P
Anyway, I would like to see an 'inheritance mode'. After your reign ends (you get killed/die/abdicate) a new emperor(s) comes to power of some or all of the planets after some years. During the period of turmoil / civil war:
- some planets may leave the empire
- the empire could split
- some planets may be abandoned
- some infrastructure (star bases, etc.) may be destroyed
Star map would stay the same and characters you knew may still be in the same position or even have achieved greater power.
Obviously that would quite a big deal of effort, so I don't expect it soon. :)