https://together.jolla.com/question/96836/tohkbd-faq/ This is very incomplete. Or rather: How long before I can use my QWERTZ like a QWERTZ?
A: Jolla Sailfish 1.1.6.27 version (and older) does not support changing keyboard layout. We need to wait for sailfish update. Current layout does not support compose or special chars outside of pc-105 US layout. The settings are grayed out becaused they do not work yet.