A vehicle mod would be cool to see. Probably the only time anybody will ever be able to see a van climb walls and fly, anyway. Or watch as a motor home beats up Dr. Robotnik.
Anyway, does the spin lags the heck out of anybody else's computer while it's being used? Granted, I am using my older brother's old computer, but it apparently runs City of Heroes just fine, so it should be able to handle sprites appearing really fast on a Doom engine-based game. It runs just fine after the spin is done, I can look at the stars it made with just a really minor drop at the most.
Also, I don't think this character can finish Mystic Realm, I haven't been able to get past Verdant Forest Act 2 with it. I'm pretty sure it's because it's jump doesn't go as high as other characters, making it unable to pull off certain jumps that other characters can easily make. You might want to consider increasing it's maximum jump height.