Currently non-moderators can flag off-topic posts and suggest that it either belongs in meta or on stackoverflow. It seems that cs.SE is a target that makes at least as much sense as stackoverflow for a suggested location where the post belongs. Should there be an option for flaggers to suggest the post belongs on cs.SE?
I think the general SE attitude is that until graduation, migration to a beta site should not be done (since the site might just go away), so we should wait till [cs.se] exits beta and launches.
ps: since the betas are taking much longer these days, they might have reconsidered this attitude, but even in this case it is too early to add the migration option to the list.