It requires a custom device handler. Try this one. Switch it in the ide, get everything set to your liking, and then switch back to the default so it can still run 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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