Don't get me wrong, the movement speed works very well when going for a scary wad run, but I think having an option for regular movement speed would be neat!
I downloaded it and tried using it through Doom Mod Loader but it just keeps saying stuff like "No such option as +fullscreen". I know next to nothing about this kind of stuff so I don't think I know anything more precise.
Don't get me wrong, I love these guns a lot. The only thing I feel could be an issue is that, since the Chaingun takes the SSG's spawn, the Shotgun tends to not run out of ammo while you might not get a lot of use from the Chaingun.