I would say no - we shouldn't muddy the waters with questions about pre-release software. However, we do allow questions about how to get back into a release version from the beta version and if that teases out information about the beta to correctly answer the question I see no reason to remove that information.
I see things this way - the audience for beta software is very small before it's released. Now after that window has passed, even fewer people can get the software and those that did get locked out quite rapidly since Apple is in the habit of expiring all beta software (search Apple discussions and this site for all the urgent questions about what to do when beta Mountain Lion and beta iOS 6 software stops working).
However, just because I say no in general, it's fine to try one question if you're OK with it getting closed / edited / worked on (or over) as appropriate.