It does. Then I cold start controller and open it up and it's all zeroes again. The changes don't take.
It sounds like your num pts is too high. Are you putting in 32? GIs go up to 16, so if you want to use more CPCs than that you'll need to configure 2 GIs.
But I don't think that it can be directly mapped to GIs.
They can. I'm doing it right now with an R-30iB Plus Mate.