Most of the time both have the same values so it would be nice to have an entries in the context menu (like "extract (remix)") for
Quick tip here:
1) Select all items in the Rel. year column, press Ctrl+C
2) Move to the top cell of the Rec. year column, press Ctrl+V
This will copy all entries from rel. year to rec. year (works in the opposite way also of course)
Rec year shall not be added to album level, that would be bad design.
I would suggest the recommended solution or that you create an action with the action manager (or a script) and that you include that in your workflow.
1) Tag files
2) Execute sync action/script
3) Do your next steps..
>>Wouldn't attach RecYear to Album, still most of the tracks are likely recorded in the publishing year of the album.
That's generally true for albums from one artist released a specific year.
When it comes to compilations, anthologies, best of albums and similar releases, rec year can be quite deifferent from rel year.