I really love this plug-in. It is such a great time saver when trying to order ones tag chaos.
One small thing:
Is it possible to make the shelf mapping case insensitive? Currently a mapping on "Literature" will omit Goodread shelfs called "literature". Also lower case mappings are sorted down to the end of the mapping list instead of alphabetically.
When trying to rename an existing mapping to change the case an error message pops up saying "ERROR: Rename Failed: A genre with the same name already exists"
On a side-note:
I would love to see such a tag mapping feature as a general purpose plug-in. I.e. a plug-in with a customizable mapping-table that goes through all books and remaps all found tags according to the table.
Many thanks again for all your great plug-ins. Much appreciated.