Erm, I can try. Coding is my job and I'm a bit behind in the bills right now. I want to wait a bit before diving in to modifying the core. I am starting to look around in the code though.
What is the exact shadows/door bug? Doors won't cast shadows for the same reason other destructables and dynamic objects won't, shadows have to be baked. If it's something else please explain. I did explicitly say a full dynamic lighting engine wasn't going to come from me
On the other hand if there is any work in this area I may contribute if others are active.
Also I like the idea of destructables highlighting for clarity. Doors do this.
I was thinking it shouldn't be too hard to be a fire-once for message entities. This would be a better first task for me on the project than lighting revamps