Ah, I think that I may possibly see your point? The personalisations tab has always been a mystery to me - looking at some of my own entries:
Highest value of shopping cart that can be approved BBP_APPROVAL_LIMIT
Value above which approval is necessary BBP_SPENDING_LIMIT
So, are you saying that these entries could be set to interact with the role functionality?
Probably completely wrong idea on my side.
Kind regards
David