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@Ced
My brother does unicycling, and KrisHolm, a very good brand in this field sells double insert cranks 150/125mm so you can change crank length in minutes. My brother also does freestyle (like flatland bmx on a unicycle), and he's running 90mm cranks on his 20" build.
Basically, it's hard to get going and to slow down but top speed is improved.
it's useful on a unicycle because it gives you some sort of gearing without the need for demultiplication. I'd only consider shorter cranks for my massive pedal overlap and ground clearance.