Thank you for your great feedback! I'll check all of these thinks next week and will file tickets on GitHub for all things I want to change.

UPDATE 4.6.:

1. is planned for a future update.
2. a warning is planned for a future update.
3. it's not reproducible
4. it will be a bit better in Bookmarks Organizer 1.2.0.
Nitpick 1. it's changed in Bookmarks Organizier 1.1.0.
Nitpick 2. it's changed in Bookmarks Organizier 1.1.0.