The More tab's style and colors aren't actually customizable at the
moment. I know it sounds like they should be, given those keys.
The issue is that, to customize it, we have to do things that Apple
doesn't want us to do, and that could in theory get the app rejected
from the store.
I may just end up writing a replacement More tab that works the same
way as the built-in More tab, but that allows customization. It's a
big job, though, and it wouldn't be a top priority (unless it gets
voted that way).
-Brent