For those of us using X-Plane to help maintain our flying skills, especially IFR, it is very handy to have failures of various instruments and systems occur at unexpected times. It is far more realistic to have something fail without you expecting it so you have to learn to recognize and debug on the fly, than setting it up so you know it will occur during a particular flight.
This setup can take some time. For example I setup failures of IFR critical systems for MTBF greater than reality, but rare enough that they surprise me. The MTBF varies with the failure, so I get frequent practice with the vacuum system going out, and only occasionally get a bird strike. I have no interest in most failures listed as they are not realistic or relevant, so setting a global MTBF does not make sense.
Unfortunately X-Plane does not seem to save the failure setup (if there IS some way to save it, please let me know !), so I need to reconfigure failures every flight. This is not only time-consuming, but somewhat defeats the surprise element of this type of training.
PLEASE add the ability to save a failure configuration that always applies to a particular aircraft!