howdy, i've just installed UDN app from google play. An app which hides androids toolbar and replaces it with autohiding controls. It turns out the controls work fine with Jollas android. Here are the screenshots, controls can be activated by tapping on small triangle at the corner of the screen, caveat is that UDN app must be running in the background.

Still, now back-navigation is possible even if original back button is disabled in build.prop. Also UDNs toolbars buttons are fully configurable, so that 'home' and 'recent', or any, buttons can be hidden.

Bump. Anybody have an idea how to keep this app running as service in Jolla? Please share!