Hi

Thanks for this post, super useful!
I have some questions, though, not exactly about shelving, but on how books appear.
btw, I'm using the kobo touch extended to kepubify books and reading lists to sync the books to the device. (I don't think that changes things, right?)
Say I'd like to add informations from custom columns to the book, I see on the first post how to do it for the title, what if I'd like to add them to the author, is it possible? I remember reading someone doing it but I can't find it..
Ex for how it should look like on the kobo library view:
Book title
Series
Author - Y/N - word count
as the author is the shorter string I'd like to add a Y or N coming from the read (#read) column on calibre (Y for Yes, N for Unsorted, not No, as I don't use the No option) and the word count coming from the words (#words) column.
so I suppose I have to use the metadata plugboard, select epub, kobotouchextended, and then write the template for the destination field authors.
Can you help me with a template that would work?
Do I need to re-send all the books or is simply a question of updating the metadata on connect for it to work?
Would this potentially affect the author shelving if I one day decide to add "authors" to "#myshelves" on the plugin options, so as to have one shelf for each author?

and sorry for having so many questions!