I don't think so. Dumping the sails and getting rid of the energy in them can be accomplished by doing a few different things, anyone fo which may be appropriate in a certain set of circumstances. If you have a main with a vang, blowing the vang can dump a lot of power, and I've done that to avoid rounding up. Heading the boat into the wind can almost always work, if you have the available water and have water over the rudder.

I think your best bet is to use a harness and keep yourself in the boat, and you also need to try and avoid conditions more likely to remove you from the boat. If you want to put something on to help keep you in the boat, and keep you afloat if you leave the boat, try something like: http://stores.implex.net/sailboats/delux...0264af67e9ba311