Rocker stpooers etc. won't stop you swinging round your mooring, they do however damp your rolling.
Rigging a small stay sail will have two effects though. it will weather **** the boat into the wind and if it's blowy will keep you there. It will also profide a surprising amount of roll damping.
Further on the subject of rocker stoppers, claims that they can reduce your roll by more than 20 % should be treated with caution. They rely on the roll of the vessel exerting a force on the
damper plate and the physics of roll motion dictate that this type of damper can not have a 50% reduction in roll Motion unless suspended at the end of an enormously long pole.
Tim Abram
Bsc.(Hons) Graduate Member of the Royal Instute of Naval Architects.