Firstly thanks for commenting

hmm not sure which dead ends you refer to hehe, if you mean the doors they open from the inside if you press use. me and my friends have found this adds a bit of strategy as to when and when not to open them... there are two other places i think you might mean, one next to ct spawn the other near the big oak tree, if you run along the top of one of the walls you can easily jump across to the big branch and then run over to the buildings...
im also toying with the idea of letting people into that room with the collapsed roof but ill see how it goes...
anyway ill take into consideration what youve said.. thanks again