Hope the title says it all. If I enter, say the Year, in the first year field of an album, I'd like to copy the year to the rest of the year fields in all songs in the album. It's kind of a pain to copy the text, go to the next field, enter, then paste it one by one.
Select all files
Go to e.g. the year input box in the tag panel
Enter the year or select it from the dropdown list if one of the files already has data in the year field.
Press Ctrl-S to save the modification.