[Quoth]

Probably everyone knows this.
1) With KOReader if the Volume Keys page navigation is enabled, the PC-86 multimedia keys work via Bluetooth. If they are printed on the BT Keyboard, they'll work just like on Windows or Linux. Don't install KOReader from the App Store, but from the KOReader website.

2) I find that when reading in bed, sitting up, that I accidentally tap power and it sleeps. So I selected 180 ° in the settings panel. Then the off, sleep and startup wallpapers/screens are upside down. A few minutes work added 180 ° rotated wallpapers from my laptop. The starting screen is still the wrong way up, but otherwise the 180 ° mode is fine and means bottom edge, that was the top, can rest on a stand, your lap or the bed. Handier for wired earphones.

Next I'll make clips so a €4 book folding bookstand clips to my medium sized BT keyboard for writing using jota or page turning. Won't solve page turning in Borrowbox android app which is terrible. It doesn't seem to recognise any keyboard input.