The Insteon integration (as of late 2020) has support for button_on, button_off, button_fast_on (in code, but not documented on web), and button_fast_off (also in code but undocumented).
It would be nice to be able to receive events for brighten and dim commands from Insteon mini remotes and keypads. My use case is having an Insteon mini-remote tell a Hue bulb to dim or brighten. I’m able to do this on Indigo for Mac, but not in home assistant.