I love Roku products. This is really an enhancement idea.
I'm really surprised they haven't made a programmable remote.
It would be great if a Roku remote had all of the programmable buttons that a SideClick has. I've put SideClicks on most of my Roku remotes, and they aren't cheap. They also make the remote a bit awkward.
When I don't have a SideClick the remote for my Ultra is missing one ESSENTIAL button, the MUTE button. I have to turn volume down all the way down if I use my Roku remote, or I have to grab another remote if I actually want to use Mute instead of volume.