I like the expanse-after-victory idea. Here are two ideas of my own. Please, please, PLEASE make the game give a confirmation message when clicking to save. I know it annoys most people. But sometimes I mis-click. I have never finished a game because of this! (I've only played AI so far). I made a backup folder, and when I made a mistake, accidently saved over the backup instead. I now have a backup folder, a backup backup folder, and a backup backup backup folder! (Yes, I really am so bad that I need this
). Or if the lack of it is something enjoyed, at least make it a game option.
Also, the idea has been mentioned sometime way ago, but I liked the idea of some warp points being smaller and only allowing ships up to a certain size through. Sounds like a needless pain, but could create some strategic situations.
"They will take the standard route through Sol, a ship that size has no other option"
"But a ship our size has other options"
(Wing Commander IV quote, (I can't get enough of that game)).
P.S. See above, confirmation dialog suggestion)