Disable/enable Desktop BG from Command Line

I currently have a Bat file (that I converted to exe called "kill start") set up that disables all my "extra" processes, and fires up a video game (i have one for each game), launches my Voip program of choice, and logs me in etc. That way I only have to hit one hot key and I'm good to go. Another hot key (and another exe runs called "rez start") my game/voip close, and my other processes start back up again.

As you can see, I've put a lot of work into being lazy

The one thing that gets me is I'd like to disable the desktop background slideshow as well. (and have it start running again when i launch the second exe)
No idea how to do this using the command line. I suspect the use of powercfg, but I can't figure it out.
Any ideas?

P.S. Bonus points for figuring out how to set fans on max speed instead of variable speeds with kill start. And back with rez start.