It's great to be able to make a spotlight or point light scriptable, but it would be really nice to be able to change the direction, color, intensity, etc. settings.
Back before Sansar opened up to public beta, I created the first version of the Clockworks club. One cool thing I did with it was use a script to rotate the directional light at a fixed rate. It made for a very cool effect. So I know this much was possible. It is no longer possible, according to my tests.
One application for this would be to change the apparent time of day or weather conditions by altering the direction, color, and intensity of the directional light.