I'm not sure what you mean with 'secondary functions', but every key on the keyboard has same customizable lightning (except on the 3 small volume buttons) Never thought any complain about the lightning.
I recently also acquired a 'Corsair Gaming K95 RGB Platinum', and apart that it takes you some time to adapt to the 'special' design of the keys in the Vulcan, I'll say once you get used it is better and quite smoother in the daily non-only-gaming use (also have a Razer Chroma 2 that for me is still the best).
Maybe if the palm rest was cushion-like would be best (the one provided is rigid plastic, and gets a lot of marks of finger/hands prints and also attracts dust like a magnet)