A couple of points.
If the mags are ON but the engine isn't turning over (the prop is feathered, for instance) then the mags aren't doing anything. They're generators and have to be turning to produce any current (and the engine has to be turning to trigger the pulse).
Back in high school I owned an Aeronca Champ (airknocker) that had NO mixture control or electrical system (other than mags) much like its vintage peers, so turning the engine off/on by the mags was the norm. I can't begin to count how many times I propped (that's OLD AIRPLANE for "started") that baby.
I find fire relights a bother, but the horribly unrealistic stalls ... the un-modeled roll inertia ... the what-in-the-world-is-this-supposed-to-be spin characteristics ... it goes on ...
I do love the game!