Pro Sites & Domain Mapping: Suspend domain mapping during Trials?

With both Pro Sites and Domain Mapping loaded and activated, I setup a Trial period for Pro Sites and set Domain Mapping to only be allowed by the pro levels that I setup in the "Levels" configuration. However, I had a questions about this:

(1) The application seems to allow a user to map a domain during the trial, which does not sound like a good idea. Is this the way it is supposed to work or is it a thing with my config work?

(2) If I connect my eNom reseller account, is the user billed by eNom or do I just have to have the account open with adequate balance for my users' purchases and bill them myself through Paypal?