Wow! That's amazing!
So much that I had to tinker with it a bit, so here goes:
* You can add a suffix to the collection name, in addition to the prefix.
* You can setup a re.sub on the collection name, to transform it. (ie. I use an include "\+.?*" on tags, with a sub "(\+)(.*?)", "\2" to create collections based on tags that start with a +, but without actually keeping the + in the collection name (+Fantasy => Fantasy), because I'm too lazy to setup a custom column

).
* Config switch to automatically trigger a framework restart on USB unplug (requires the SS or Fonts hack), because it's enough to reload collections, and that takes only a fraction of the time needed to do a full restart.
* Fixed the config file save path (extra config_dir in there, at least on my setup).
* Fix ignore_prefix matching if the collection name contained an re keyword character.
* Fix error when trying to acess the customize plugin menu without an existing config and no Kindle connected.
* Handle update of config files when new settings are added to default rows.
Thanks again for your work, I'm *finally* using a proper collection setup thanks to this

.