This is an experiment in cheapskating(free heeling haha), and I plan on skiing this setup all winter, so I will keep you all posted.
I'm very much in favor of any requirements for skis to remain either attached to the skier, or to have some other mechanism (like brakes) to keep the ski (s) from becoming runaways. I saw a tele ski fly over 100 yards downhill once and that isn't just a safety issue for anyone in the way. The skier in question had to post hole that 100 yards to retrieve it. Imagine terrain (like a cliff band) that could have prevented him from finding his ski at all, or the ski being buried in deep snow. I'm not an advocate of leashes. I think they are dangerous, especially in an avalanche scenario, but at least they are only dangerous to the person wearing them. Skiing without leashes or at least some type of ski retrieval device in the back country is asking for trouble imho.