I think the cars are pretty fun and you can jump over them if you are skilled enought or prop surf over them plus if you are a T it makes it easy to get away with silenced scout kills lol
It would get RTV'ed alot or the server would loose alot of people though.
another problem with that would be the lag if people have 120 fps it would be halfished because a second map is added in so rip.
Now while i totaly agree with your arguement i think like a tic tac toe game on the wall would be cool. that would would play with like bullets idk just little SIMPLE games even plugin based ones like rock paper scissors. So that inno's could do like RPS to shoot eachother or something lol. it just sounds interesting.