systemsettings5 correctly displays settings for KF5 applications, so
it's just a question of more KF5 packages making their way into the
archive. You can verify this by installing bluedevil (currently
4:5.3.2-1 in unstable) : a bluetooth icon appears. I have also built kwin using the packaging in the Debian Qt/KDE Maintainers git repo, and the window decoration settings appear too. Cheers, Jeremy |