Transparent tips would have to be something that NVIDIA does at their end, don’t think the HairWorks API supports transparent tips either.
The one directional light is just a limitation at time, I suspect that they will get more lights implemented at some point, probably grabbing 4 or more of the closest lights and averaging out the results or something along those lines (Thats just a guess on my behalf, I do not speak for NVIDIA, so they may have completely different ideas).