Hey man, sorry for leaving you hanging without a reply. It's been a while, so I'm not sure if you're still playing the game or not.
But I did eventually get around to getting one of your requests implemented, for the "Oriented light cones".
At first I didn't know how to respond because oriented light cones seemed maybe difficult, as I'm bad at actual math and geometry.
But, I did do it, and I think they turned out very well. Also there is a new Per-Planet Settings GUI configuration, so each planet can have different colored lighting.
Anyway, regardless, thanks for the suggestion, it kept me busy thinking about how to do it. And eventually I got around to it.
As for your "dual-directional, multi-colored" light, I don't really think so.
Light blending will be a huge pain when the lights will intersect, and an eye strain, and that would double the resource drain at least.
Cheers, and thanks for the idea. It kept me busy from being bored on the weekends.