Has nothing to do with SSAO if I understand it correctly. SSAO is what adds shadow to the corners and stuff (look around where the radiators meet the underside of the wings of 110 or spit or 109, you'll see a gray'ish shadow in there. That's SSAO.
Example from Half-Life 2, look behind the phone stand. That shadow is created and calculated from SSAO.
The ambient light reflection glossiness thingy should indeed be an option since a few people here chose "no". I liked it a lot and have not noticed any particular increase/decrease in stutters/FPS since that was removed, I only noticed improvements in FPS after the huge terrain generating patch and turning down buildings detail