Custom Configuration

That's correct if you wish to do it multiple times...
If the driver resets that value, then yes, having a handy revert would be useful.

It looks more like a parameter that you'd set "once-per-lifetime," and there's a slightly better solution:

The Super basic Z-Wave tool is a device driver you use in place of the real one, change parameters, then swap back to the real driver.

As long as the driver doesn't reset your value when you press Configure on the device page... you're good.

The motion sensors I have (Aeon Multisensor & Dome) have a place to set that in the driver itself.. unless I misread your question/solution.