Not sure how this would affect queues, but for any raids I think that tanks should have the options to queue specifically as MT or OT; and the roles will get some party window indicators so everyone knows exactly who the MT is.

If you queue as OT your provoke ability takes an enmity penalty, so you won't be able to use it to pull off the MT. If you need to tank swap then we can buff/adjust shirk to counter the penalty and allow the OT to provoke aggro until whenever the MT decides to provoke it back. Would require a little more MT/OT coordination then what would normally be required, but nothing too crazy.

This would get rid of that awkward "who's going to MT" moment at the beginning of every run; it would stop tanks from provoking back and forth mid fight for no reason and it would stop OT's from intentionally cleaving groups.