Shadows on procedurally generated map

Hello.

I have game with procedurally generated map, that means, that i can’t build lighting and shadows. And if i want shadows in game - they need to be dynamic even if it’s just a wall that not moves.

So is it possible to somehow optimize that? Or maybe it’s possible to build lighting inside BP? Or just disable updating of some shadows?

Alpha version can be downloaded here: [rooMaze by Chair killing][2]

P.s. I use UE 4.10