The most important but most neglected part of forced approach training IMO is the cause check. A review of the accident record shows that up to 80 % of engine failures are caused by the actions or inaction's of the pilot. Some of these are not recoverable (eg running out of gas) but in many cases power can be restored by prompt effective action of the pilot (eg switching fuel tanks). Flight training does a disservice to students because the emphasis on flying the maneuver to get a good score on the flight test diminishes the importance of training to minimize the possibility of the engine failing in the first place or if it does fail, immediately recovering engine power
The accident statistics also hint that for every full engine failure there are probably at least 2 partial engine failures. This is never taught at flight schools but the decision making for a partial engine failure is a lot harder than for a full engine failure
Finally the condition of the field is the least important think to worry about in a forced landing. If the engine fails the insurance company just bought your airplane. Your only job as a pilot is to get the airplane down without hurting anybody, the condition of the aircraft afterwards is irrelevant. Therefore field selection criteria are in order of importance: be close, have the minimum amount of obstacles on approach, and be reasonably flat.