KDE Kiosk Ranges support

KDE Kiosk is a great feature, for allowing companies to limit specific configuration, by setting values immutable [$i].
This is generally a great feature, but it is missing the support for ranges. For example, in the case of screen locking and the grace period. (which is generally a cool feature, but can create bugs on some hardware) You might want to allow people to set it, but block them from setting values over 5 seconds in this example.