I dont want to play an incredibly half arsed "race" game. I bought a shooter, I want to play a shooter.

I have added the race cash into my inventory with the console, but the mechanic still wont sell me anything. Is there a command I can use to force him to sell me things? Or at least a console command to fit miniguns to that ridiculous buggy I have to drive so that I can play the game I bought?

You can change to easy mode for racing, then switch back to whatever you have. The racer AI does actually decline, it's just not as noticeable because all they're doing is driving their path.

Or you can use one of my savegames where I've saved after the races
But then, whatever stuff is in them is what you'll have hehe