I think that I saw this version a while ago. I think that we tried it on a server for a short time.
Double-jump allows getting outside of the map-world, unless this is a "fixed" version with some invisible barriers added along the rooftops. It was interesting to play that way. We were able to get behind the gate at the end of the map and fire upon the Allies trying to move the jeep to there to win the map. We could shoot through some walls back into the map, but not others.
It might work on Silent servers that don't have the double-jump.
It would help with the choke-points that so frustrate some players some of the time.