When using the registerScreenEdge in the declarativescript the user should be able to set the hot corner from the relevant KCM afterwards. Reproducible: Always
makes sense, but is tricky. So far the list is hardcoded and stores the settings of the effects in a hardcoded way.
Fixed in 5.9 Just add X-KWin-Border-Activate=true to your metadata file and your script will appear in the KCM.