by taniwha » Mon Feb 25, 2013 5:28 am
I haven't noticed anything in the renderer that makes a distinction between the world bsp and other bsp models for any limitations. While its usefulness is debatable*, there's no reason I know of you shouldn't be able to load a second map as a non-world bsp model.
* I can think of some, but that would require specially crafted maps to make it worth while.