But doors and windows are treated differently from lights at the moment, and lights specified for a door will be simply ignored.

Yes, and by all means, this is certainly not a problem. Of course, I did not expect the combined window/lightsource to work, but I just had to try...

But the more clever features you add for furniture, the more users may want to do with the furniture interface. So you may want to keep it in the back of your mind if you work at the furniture properties interface (also FurnitureLibraryEditor). But again, very nice features - and nothing that cannot be solved.

ok