Hey, I'm currently a player on l2MxC and I found that interseting so here's what I'd like to apply:
Client Editor: you can check what I've done for interlude system files here
Webdesigner: I've done the webdesign of that website as example
GM: I'm not sure about that though, I'm more a player than a guard/policeman.
French Translator: because I'm french.
English Quality Check: because my english is pretty decent.
Beta Tester: I've got some exams until July, so dunno if I'll be able to play until then.
If you wanna know more about me:
My youtube account: http://www.youtube.com/user/MayhemL2
I'm currently making a huge work on my next movie, based on lots of frapses made on L2MxC
My dA account: http://mayhemydg.deviantart.com/
My facebook fan page (haha...): http://www.facebook.com/pages/Mayhem/273232440185
I've also intended to make my own L2j server months ago but I dropped it because I had no money. I could have made a great server because, as a player, I know how to make PvP/PK and the overall gameplay interesting ;D