forget thee guys... the idea has merit
on my yami, during my longer straight runs, i would shove my whistle between the throttle and the back, and it would hold me at about 30mph, a poor mans cruise if you will.... worked just fine. my ski was boring anyway, big xl760, didn't really go fast and the turn radius was about 100 ft, so it was just fine... after i got my xp... i didn't feel the need for cruise, since the ski was more "fun" actually i had forgotton completely about it until you posted the subject... a clothes pin works as well, but its a good idea to lanyard it to your wrist or vest, that way, if for some reason you fall off your ski won't speed away at 35mph w/o you...
I personally don't think its dangerous at all if you have quick access to remove it... IO its no more dangerous than having it in a car....
so you might want to tinker with options or items that you can put in the throttle gap... you just need something that gets slowly wider, (again like a clothespin,,,, and isn't real slick)
downside.. sometimes it will just pop out, and when you let off the throttle the ski slows down realllll fast, so don't stand up while "cruising"