[AgentZero]

Tweaking of ship experience. Basically, instead of the current 1% per kill, ships gain experience almost like characters in an RPG. This would allow ships to be given an experience value, and therefore destroying larger ships would give ships a greater bonus. ie: An escort is only worth 200 experience, but a dreadnought might net you 10,000. Also, there should be experience bonuses for when a ship destroys a ship that's bigger than it, and penalties for taking out smaller ones. If the game could track how much damage each ship did to another, it would also allow for a more fair distribution of the experience. So if one ship does 90% of the damage to another, but doesn't land the 'kill-shot' then it still gets 90% of the experience value of the ship.
Every 'level' a ship would gain a small boost to various abilities, and every say, three levels it would move up a rank (from green, vetran, elite, etc) and get a larger bonus. This would also have the side-effect of ships continuing to get better once they hit Legendary status.
I know it's not the most realistic of things, but I think it'd make the game more interesting.