Hey if there is no limit, go as high as 64 or 128. Maybe, at best, offer the ability to use multiple lightmaps for one BSP. Can that be done? I'm not asking you to change the render engine. I just want more BSPs and/or multiple lightmaps for each BSP if it's possible.

If I could load in different lightmaps for the same BSP (i.e. shadow positions), I could save on BSP usage, thereby saving on total disk space.