Allow modification of migration items after initial migration

[MPeti1]

Feature Description

I think it would be great if it would be possible to change what is to be migrated after the initial migration, in case of a migrated repository that has mirroring enabled.
Specifically, what I was thinking about is enabling migration of certain kinds of data that wasn't enabled before. I see that this might be problematic with data that has a counted id, like issues and PRs, but this could be useful at least for Wikis, and maybe other things too with appropriate restrictions.

Screenshots

The migration items I was speaking about:

[lunny]

OK. Migrating Wiki should not require token.

[MPeti1]

Thank you, that was a problem too that I had.
Is it possible to enable/disable migration of the Wiki after the fact, though?