Most all of the edits you are going to make can be done with the source code. Predominately, most of the things that RG even needs done are things like in-game menus (eg. simulator, fiction, etc.) and a few added features like leech cannons or a ship choice screen.
Oh...well I am posting I might as well add a few requests:
A camera look at follow function would work nicely for several of my in-mission camera scenes.
Some improvements on the killboards would be great as well (eg. different colors, scrolling capabilities).