i experimented with an ingame light mapper this weekend:

it can automatically generate light maps for a model based level directly in the engine. it already supports multiple colored point lights with falloff. casting shadows can be enabled or disabled for lights. (i always wanted this possibility in wed! it makes using fill lights much easier.)
you can change light settings in the engine and let the light map update immediately.
it's still experimental and work in progress and i hope everything works out.
