You can’t get exactly what you want with a stepper widget. You might be able to with a slider though. If a slider won’t work, you’ll have to implement something like Debounce [3.2.0;3.4.9] which is a rule template you can install from the marketplace. You’ll need two Items, one that is on your UI and the second one that gets the debounced value only after it stops changing for the configured amount of time.
