I like it. And if a Sidewinder can be mounted on a Hobie Cat it would be a snap to mount one on a cruiser like ours. As such it could be very effective against the people in anchorages who run their generators all day and half the night, or play really annoying music at full volume through their flying bridge speakers even when nobody is up there. Or to clear off a mooring buoy if you arrive in a marine park and find all the buoys taken.
As to the PWC thing, you could also try to do what San Juan County did a number of years ago and simply ban the recreational use of PWCs in the county altogether. The ban survived all the court challenges and as a result, no buzzing, chain-saw sounding hot doggers on PWCs in the San Juan Islands. The only legal use is law enforcement and emergencies.