I don't think it should be necessary for mappers to be forced to hand over a .map, you should be able to figure out most of these things (clip brushes, misaligned brushes, misaligned textures, hint brushes [just look at r_speeds], etc.) by just playing the map. If you get caught on something, well obviously that area wasn't clipped etc.
Not handing it over just means that nubs like chris123 or whoever can't jack your map and w/e ^_^
edit: post 3oh!3