Rule Machine for multiple devices

Are you talking about fade times beyond what the dimmer itself is capable of?

Notice that some use cases for ignoring a change are just the opposite, i.e, increase if brighter, but don't decrease if lower. This leads to some complexity of selection.

I will look at it.

I'm referring to the existing fade durations that can be set when creating a lighting action. Nothing specific to the dinner (what I am not sure of if behind the scenes Hubitat is sending multiple level set commands or a single level set with transition time). In my case I am just using the generic Zigbee dimmer dth.

The additional logic to ignore certain lights is likely too specific and perhaps could be handled a different way.