I did read the whole thread and I don't remember seeing a reason to have it removed from the GT servers. How do you know the map maker didnt intend to have the cave like that. I agree that passing the flag through the glass is cheating. But if the map is made with a hole that you can fit in i don't understand why people are complaining about it.
Edit: someone should just remake the map and make the glass inbetween the flags thicker. The cave is NOT an exploit. You got capped on bix suck it up.