My dad made a couple they’re really fun! It’s a bit like regular feet on frame coasting except you’re more… Stuck to the unicycle…
The first one he made had a back pedal break and is significantly easier to ride, you can control the speed down hills which means actually being able to go down hills!
I don’t think you could practically go from A to B on a normal freewheeling unicycle. I’m not saying unicycles are the most practical vehicles but I’d want to at least be able to stay on the entire time.
Although maybe for skateparks, stairsets and freestyle routines, but not distance - never distance.