I am happy to announce that KOReader has been ported to Quill OS as a regular and integrated component of the GUI, though the old reader is still there with an option to switch from KOReader at will.
Hopefully, this should make Quill OS much more usable now. The reader we had was quite crappy.
KOReader will be bundled along a next release... soon.
Here's a video:
https://www.youtube.com/shorts/-apoeVBc9WU