The way the job market is in game designing is that you pretty much don't get a job unless you have prior experience. Most people get experience by creating mods and maps, or by working on larger projects such as Renegade X. This will look extraordinary on a resume, I'm sure.
As mentioned before, the developers cannot accept any money due to legal issues with EA. If you wish to support Renegade X, I suggest the following:
1. Donate to the server hosts that will host Renegade X games (e.g. Jelly server)
2. Advertise this game to your friends and on online communities. If you can spend money, rent some ad space.
3. Wait for TotemArts (the Ren X devs) to release their first game, and buy it.