Add blue and UV for the whole cycle or just select times? Best way to find out is just try it for yourself, I guess.
I own a few small UVA+B reptile bulbs, but I haven't gotten around to using them yet. From what I've read, they should be used toward the end, for finishing, but someone with experience may have a better idea. Same with blue, some people suggest finishing with more blue.
My very first grow with Quantum Boards was a 4000k, 90 watt panel on one plant, Seedsman Northern Soul Feminized, as a test run to see if I liked the boards. That run sold me on them. I pulled about 105 grams, and it was pretty frosty, too. I don't know if running 4000k had anything to do with it, but I was happy.