If it has advantages over the current "Progress Sync" and/or "Zsync" plugins, or if it might be a useful addition, you should consider contacting the
GitHub Koreader team.
Luck;
Ken
P.S.; Koreader runs on, and can sync with, Kindle, Kobo, Pocketbook, and an expanding number of Android devices. (There is no actual "list", as far as I know.)