Question about Multiple installs

[MDykas]

Hi Guy's....I've just recently returned to this game and I'm back in the learning curve.
I've done a clean install and took care of all patches and mods that I wanted. I installed this on my G: Drive which is a Small WD raptor. Anyhow, I'd like to know if I can do another install and do it up to the latest and greatest Gray Wolves. I know that if I put the DVD in and try another install, it only allows me to repair or modify my current install. What's the best way to do this and is it possible. When I first purchased the game when it first came out and all the forums fired up I remember that there was a way to get into your deck gun and change reload times and ammo, but I can't seem to find that mod around anymore. I think it had something to do in the Cfg file if I remember correctly. If any of you old timers (long time gamers) can bump my brain on this I would appreciate it very much. I used to have good times with my Deck gun and kinda hope in my fun install to get it back again.

Thanks,
Mike