Hey again  , as I see DE now can support ransparent textures for brushes.

And it seems it work in editor with HW mode:
Image: http://s1.ipicture.ru/uploads/20130630/OzSlxiE4.png

But in game mode such brushes become opaque if lighting is enabled. Other problem is that textures behind transparent brushes sometimes become black. Does anybody know how to fix this?