Seems to be my IvaN day today
The problem at the edges u can avoid by placing the brushes differently. Let the ceiling brush lay on the wall brush like this:
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But this is a problem which was discussed very often here and u surely will find some nice threads on this topic.
The door problem is caused by the ancient Mohaa engine. The light is calculated during compile and won't be changed during gameplay anymore (i.e. no dynamic lighting like in Doom3). U can place a brush inside ur door to block the light, which would probably look better than vice versa, but it won't change by opening the door nevertheless.
I've made a pool with springboard which u can find in the recycling bin. Dunno what texture I used...
Edit: Oooops, texture is missing

It's taken from the venice map... Very embarrasing. U still want it?