What can we do with the sourcecode?

[Disconnected]

GUI improvements would be at the top of my wishlist...

A properly zoom-able map.
A clutter-free map.
Mouse-wheel/arrow key support for scrolly-bits.
Improved waypoint-setting system.
A way to store & retrieve strings of waypoints, preferably named strings..
A sub-system chat as the default channel.
Properly scalable GUI.
Player search function.
Friend list function.
A "ping all faction members in system" function.
A "ping all faction members on server" function.
... And that's just off the top of my head.

In a somewhat similar vein, an update-able newscast would be pretty epic win. For example, a while ago some crazed Rhinelander decided to declare NY Rhineland territory, and he was actually in NY (with a lone battleship, I think - I didn't see the guy, just overheard). But will it make the news? Not as it is. Though it really, really should.

And of course, a proper supply/demand economy sim. That's arguably the single most important thing anyone can do with the source. If it ever materialises. Also: no way I'm up for doing that - just saying.