Would it be possible to increase the sky in this map, when you are at the grenade launcher it's impossible to use a boost jump there...
It might also change gameplay a bit (movig from side to side over the walls, or worse: walk over the walls)
Maybe they can be fixed by putting spikes on them and making it a killzone ? Or maybe at a force to push one off trying to walk or jump over them...
Don't know if you can it a real "bug" though....

It was like this in the pre 2.0 test phase and was changed.. so i'm not sure it will be changed back again.

I can imagen why they changed it, and ofcours would need some tricks to prevent players from doing certain things ... With might not be too nice ...
You could ofcours simple always place an invisible tall wall above the real walls and allow bullets to pass but no players ... should also fix it .... Just think the ceiling at the grenade launcher is an issue when you want to trickjump to the other side ... (I always hit the ceiling and drop down to fast )

I think one can not hit the ceiling there.. maybe your tricks are not yet right or good enough?