Mike, I don't tape my tether quick release shut. I don't have any quick release at all. I just use a regular, non locking carabiner, similar to this one:
http://www.mec.ca/AST/ShopMEC/Climbing/Carabiners/PRD~5015-876/petzl-owall-biner.jsp
So it is very easy for me to unclip it if it is not under extreme pressure (like if I was being dragged behind the boat)
Your worry about being somehow trapped by the tether is reminiscent of people who won't wear a seatbelt because they are worried about being trapped underwater in their car. You need to consider the odds. As small as they are, the odds of being flung off the boat by a big wave are much greater than the odds of having the tether wrap around your neck in some freak situation.
If you are more worried about the tether than of going over, then you are not wearing your tether often enough. If you wear it all the time, like I do, you will get to know exactly how it works in all situations. You will learn every thing that it gets stuck on when you are rushing to the bow.
In case you want to know, I've worn my teter on every single one of the many hundreds of trips that I've taken over the past decade and it has never - not once - come unclipped from me or from the jack lines unintentionally.
Just like riding my motorcycle without a helmit, I actually feel naked if I'm sailing without my harness and tether. On the few days a year when my wife come sailing with me, I feel really awkward if because I don't have it on.
Jud, you might want to have a second, short tether, back near the cockpit where you are likely to be sitting most of the time, or perhaps a short one clipped at the bow where you will be working in the bounce while changing headsails. The problem with a second carabiner on the same tether is that it will be dragging on your boat, making lots of noise and getting caught on things.
Ragner, it is completely unacceptable if you need to unclip and reclip from one jackline to another to move from the cockpit to the bow. The reason being that one day, in a rush to the bow, you won't do it.