OK, even accepting that the actual process of migrating questions should be left to moderatorsshould be left to moderators, the current user-interface flow is suboptimal. So I suggest adding one more option to that dialog:
You could do this both for the flag-for-migration case and for the vote-to-close casevote-to-close case. The technical effect would be the same in both cases: a moderator would have to migrate the question. But the user experience would be different:
- Selecting an option and entering text into a field feels like going forward, in contrast to the back or cancel-and-flag steps required otherwise.
- Going forward feels like one did the right thing, whereas having to go back feels like having made an error.
- This approach also reduces the number of clicks required to get this flagged properly.
- Having only to enter the name of the target site, instead of a full sentence, caters for
lazybusy people.
Seeing as this question here currently has status-declined, you might want to also look at this more recent answerthis more recent answer along the same lines, and if you voted here, vote for that, too.