i did some research on it after seeing this post, and from my understanding it does have to wind down, as on a chain saw, but you can use the lever to manually disengage it just like a regular clutch with a lighter feel. so if you come to a calm, slow stop the clutch will disengage automatically and you can stay in gear while stationary. if you need to rev the motor up before dumping the clutch, you just pull the lever in and rev the motor past the rpm that the clutch engages at and then let it go as you normally would. and if you need to disengage the clutch while running, you just pull the lever.
if im wrong, please correct me. this is just some of the basics i gleaned from a google search.