I've used rekluse clutches on my race quads and they are very nice. They are a fully automatic clutch meaning you can put the thing in gear without using the clutch at all and it will not take off on you, or you can stop the machine while in gear without pushing in the clutch or even shift without using the clutch. when you want to go you hit the gas and as the rpm rise the clutch engages itself. if you wanna stop just hit the brake and stop and the clutch will disengage automatically. I also found them to be extremely durable even under extreme racing conditions that I put them through (my clutch plates were actually lasting longer than with a standard clutch. Another great thing about the rekluse is you can still use the clutch like you always have if you want to. I let my buddy ride my quad for about a half hour and he didn't even know it had a rekluse clutch in it until i showed him. Finally they are fully adjustable meaning you can adjust: 1 - what rpm they start engaging, 2 - how fast or slow they engage, 3- how hard they clamp or slip.
For rock crawling it would be awesome because you cannot stall the machine with a rekluse in it. It would be very similar to crawling a xp1000 (or any cvt sxs) with high and low only instead of high and low speed you have 5 speeds and the ability to shift on the fly whereas with polaris or can am you have to stop to shift between high and low speeds.
i'm super excited about the 5 speed transmission and so glad I will no longer need to replace belts in the middle of my riding trips. Now I just gotta sell the xp!!!