I have a few (probably already suggested) suggestions:
1. Jump engines, pretty clear on that:P
2. A graphic make-over, Everything bigger and nicer,
3. Ongoing fights, lets say you have a war between kusari and corsairs, the corsairs destroy a space station, the space station is destroyed, and stays that way! this keeps a certain realism in it. This is good for servers that do an ongoing story mod in their mod on the server.
4. change the way of spawning, always in groups of 2 or 4 of 5 or 6 after a certain amount of kilometres, keep it more random on which times the spawning happens.