a) there is some talk about that, maybe, we need to discuss about that further (you can hold the button instead to click it 100time)
b)for some rooms in the foundry we made that already. Because of the way the engine handles transparency, it would look ugly (we tried that already), and reworking everything would take to much time that could be spend on new content.
c)this is already implemented (if not please provide a screenshot so we know exactly what you mean)
d)that is a possibility(maybe there is already a key, i would need to ask styg when i will be back at the office)