Personally I like this idea. I used to play on another wcs(jyd) server long ago that had certain weapons and certain races restricted on maps that made them incredibly OP. I'm not sure if the map based limitations are still possible in the current iteration of css, but that would solve any issues with having to have map specific rules regarding guns or races. There is a russian wcs server that I currently play on that mostly plays aim/fy maps and it is a lot of fun, though I lag quite a bit on it.