We don't move things to beta, its just not how its done. This post states the reasoning behind it. If SR.SE makes it past beta, chances are not all questions you might want to move would make the quality criteria in any case.
That said, if I saw questions that are unwanted here, but would make a great fit there, SR.SE was out of beta, and I'd talked to the relevant mods I'd probably end up flagging it for migration, rather than relying on VTMing
