I bring thee not simple rearrangements, but a whole new world of possibilities,,,

[Zeph]

Why can't you do baked textures for levels which you just layer shadows from non-bsp geometry onto?

It takes more memory, but it's cheap on runtime. But there's a reason why only Unreal 3 is pretty much the only major engine still using it. It sucks and there are tons of better methods that move to a more accurate and real time method.