I am using thread notes (as older versions of vBulletin did) to store "Thread moved from a to by by c at d" and display this on showthread (only visible for moderators) on my board.
Furthermore, I added a few controls to the Copy/Move screen that allow to enter a reason and select what should happen with this (New Post Only, Post & PM to Threadstarter).
Could this be interesting for you?
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