This is indeed an interesting thread, but so far the discussion has centered on only one kind of emergency. I am not so sure you have to create artificial emergencies, losing or forgetting gear, etc. Real life will create these situations soon enough.

I would recommend first aid/emergency medical training. Sooner or later,it will come in handy, not necessarily just in an outdoors setting. Also, perhaps spend an "unexpected" night outdoors. Work on fire starting skills. Creating fire is crucial to a satisfactory conclusion in many situations.

Study up on the subject and learn from the experiences of others. I found that reading the annual issues of "Accidents in North American Mountaineering" quite informative and quite useful when it became my turn in the barrel.