Jono,
You know, your thoughts are very much in line with another pilot/mechanic who has far more experience than me. He posited, "Why do we only check our ignitions systems at one particular time (runup) and one particular RPM (XXXX RPM)? why not occasionally check at idle, cruise, other RPM settings, other conditions of operation, etc? - a person might uncover something they really want to know about."
I also think, given the unique operation of a rotax ignition, this is another thought that would support the case of having separate mag switches so a person could do this (like Skysteve and others have done).
Obviously my engine was starting on one mag till the other module died for who-knows-how long. Almost all engines, other than aircraft engines, run on a single ignition - no problem with that.
I like your thought on this