Try this handler to access the parameters JD mentioned. I usually change the device to use this, change the settings, then change it back to the default device handler so it still runs local.
I have created a new device handler for GE Dimmer Switches. It is a copy of the standard SmartThings “Dimmer Switch” that is normally used for the GE Dimmers but adds the ability to change all of the “advanced” features (Indicator Light, Invert Switch, Z-Wave Dim Steps, Z-Wave Dim Delay, Manual Dim Steps, and Manual Dim Delay). In the past I have used the “Pablo Dimmer Switch” to set these but the perfectionist in me didn’t like the hacky nature of that solution. Other than the added settings this has no difference from the standard handler so for day to day use I suggest using the standard handler and only use this to update settings.
https://github.com/nuttytree/Nutty-SmartThings/blob/master/devicetypes/nuttytree/ge-dimmer-switch.src/ge-dimmer-switch.groovy
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