Moderators have access to some more options for migrating questions. There are some small aspects to that that could be improved:
Moderators can currently remigrate a question.
This makes no sense at all, there is no reason to ever remigrate a question because remigration is not properly supported and it tends to break in all kinds of ways if you actually do it. It should not be possible to remigrate a question, even for moderators.
Moderators can migrate to every child meta.
If we type the site name, we'll always get two options: the actual site and the per-site meta. This sometimes leads to the moderators migrating to the meta site accidentally. But there is no reason to ever migrate to a foreign per-site meta, the only useful meta targets are the site's own per-site meta and the main Meta Stack Exchange. So I suggest to remove the foreign per-site metas from the list of migration targets.