I don't, really :S I've heard there's a way of implementing some kind of anti-map-hack system into the map, but I do not know how.
But if there's anybody who could do it for me, I would gladly send the the unprotected map file tho!
Anyway, from my experience, when you think somebody is map-hacking, they are most probably not. It just may seem like they are if they play well and are a bit lucky (I've been accused of map hacking countless times myself and I've never used map hack in my life)