@davidfor:
I'm sorry but I still do not understand:
1) Kobo do multiple key sorting except on Series field.
2) Only Kobo had this feature. No competitor has this.
3) They discontinued it since 2.4 without any comprensible reason.
This is is what I say foresight
and competitive advantage!
Then why the hell Kobo removed this feature
?
I love this product
, but sometime I would understand it better!