Allowing yourself enough tether to maneuver helps you to perform the functions of sailing and to avoid falling overboard in the first place.
I find it difficult to imagine creating a tether short enough to prevent one from at least going over the lifelines and hitting the topsides while still allowing the person to actually perform necessary, useful functions on the boat. Sure, you can clip yourself tightly to the boat, but then what can you do, except stay in the cockpit?
In any event, whatever system you use, you should practice your MOB drills so you know they work. When you are trying to maneuver forward of the mast in difficult conditions, fear is the enemy. If you are cautious, but secure that you will not become separated from the boat, you can more easily stay onboard and perform the necessary functions you need to perform.
Last edited by jameswilson29; 12-02-2011 at 10:11 AM.