I kinda love that buried in the koreader menu somewhere is an option that drops me at a linux shell. I have no use really for this feature, but i like it. Good for those times you absolutely have to crank out some awk on the plane or whatever. :)

Thank you, I did not know about this!

But what I'd really like is an option not to hide the navigation bar while KOReader is open. I work with technical PDFs and need to jump between applications very often.

One of which is often Termux!