You can point sub domains and domains to a real site.
But you will require a license for each domain that appears as a separate forum - including sub domains.
If you detect with a plugin if a user is coming from WAP via a domain you can load the main site with a certain style. This is the same forum, and therefor is fine.
If you detect with a plugin where a user is coming from and give it a separate navbar/header/footer/content and therefor it appears as a separate instance aside from the real forum it is considered another instance and does require a license.
If anybody has any doubts they can simply start a support ticket on vBcom and ask staff to look into their situation to make sure no license agreement is broken.
This post is just a 'for your information'. Not dishing the plugin

I like the plugin, good work.