Just found this last night on Ebay, in principle, yes it will work. However how safe it is I'm not too sure. I'd like to think that if I dropped my bike the throttle would shut off and it wouldn't be thrashing around and spinning at the side of me with nearly 300kg of mass getting closer to me......maybe NB can be the guinea pig and try it out, he likes his gadgets ;D
Cruise Control Gadget (http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=300476677899&ssPageName=STRK:MEWAX:IT)
I think out Italian friend MGvalerio has already one of these installed. I don't think the cruise control is for me. Don't like it in my car and definitely won't like it on my bike!