I don't believe that RC is as moddable as most other games i'm afraid, there have been very few actual mods for RC. If you wanted to try something new then maybe Jedi Academy would be better, it is pretty easy to mod. Even i've done some simple NPC modding for it.
As for changing your name, you'll get a much quicker response if you PM Kurgan or another admin.
"For where ever there is a n00b, there is MachineCult to make him cry and cringe."