Bumpety bump bump. I actually had to use the search function (gasp!) to see if a thread like this existed. I should have known it would be Dslyecxi's if it was anyone's.
Armed Assault has these cracks in it as well and I feel they're a lot better done than in the BF2 mod, so anyone who's interested should grab either the demo or the full game (if you're in a priviledged country where it's available). They're quite effective for immersion and definitely get your head down. If I had any doubts before (frankly the BF2 video Dslyecxi originally posted sounds a little... iffy) I have none whatsoever now. I'd love to see them replacing the pewpew sounds in RO, assuming the whole "being able to record the sounds" issue could be overcome!