(Forget about the licensing, it is assumed that if such a feature were available you'd pay for every subdomain / domain the software will be used on.)
Does XenForo support multi-domain / multi-site configurations? It is important for us to figure out if it would be possible to run dozens of sub / domains and have a common set of users and admin and user functions (i.e. bans, private messages, profiles, friends, single signon etc etc).
Just curious to see if this aspect has been addressed in the designs.
(Being probably one of the first 10-20 paying customers of vB ... I'd switch over in a heart beat if xen supported this and migrations from vb4)