Migration
###Migration ItIt sounds like the closure process for newly migrated questions needs some adjustment. The best thing would probably to have a special closure reason "should not have been migrated here from wherever and should be sent back", which would have this special effect none of the others should have.
Moderator votes
###Moderator votes II don't really see too many reasons for moderators to have extra votes with regard to the usual closure/reopening process. If the post absolutely must be shut down right now without delay (e.g., contest question), they can just delete it. Otherwise, just let them have a single vote to participate like everyone else. The only exception I can think of is to deal with a question that was closed for the wrong reason, in particular when it should have been closed as a duplicate, but I would argue that the best solution to that problem would be to allow normal users to vote to change the closure reason on a closed question to duplicate.
Unfortunately, I doubt either of these suggestions have any hope of becoming reality.