Gary, this was tackled just a few weeks ago...
...and a search of the archives will produce some info for you (none of it involving owners who used the Gale Sail in storm conditions, as I recall).FWIW my comment at the time was that I was keen to consider the Gale Sail because it seems to be a simple answer to a difficult question. Virtually all of us who go offshore do so with furling genoas, we all want a fall-back option with heavier winds and using the existing furled sail & stay isn't too expensive an option. I began to see a different picture when talking with Etiennne (the former racing sailor and founder of ATN) and hearing how tough it was to get that sail up and flying in really tough going. I'm much more pleased with my solent stay than I think I would have been with a Gale Sail, but then I'm another one of those folks with an opinion but no gale-level offshore experience with a Gale Sail! (BTW I have a ketch, which left me thinking I could have some heavier weather options with a balanced sail plan - Gale Sail and reefed mizzen. I think that's less likely on a sloop).The issue you raise about the jib/genoa sheets will exist whether you sail with an inner stay or use a Gale Sail, as you'll likely have a genoa on the forestay and its sheets will run to blocks far enough aft to foul the set of a small foresail. Consider permanently mounting two simple brass clips, carabiners or similar up forward, either on the inside of your bulwark or top of your caprail. When rigging the storm sail, the jib/genoa sheets are slacked sufficiently for their bights to be pulled down and clipped off, after which the sheets can be tensioned and tied off.Jack