Launch Feedback KCM was not saving the cursor notifications properly - Apply button would not activate, klaunchrc was not being updated. QML was using calls to Qt.later() before setting the radio button index, generating "unknown property" errors from QML and not emitting the change signal. Simply removed those calls and the QML functions properly, and klaunchrc is updated correctly.
Per @davidedmundson, Qt.later() may be too new of a function to be supported by Plasma.
BUG: 392050