Cool, let us know what you find.
Something I feel does matter significantly with this is the actual physical starting point, the particulars of the M/S or X/Y array you use, which mics, which patterns, which angles, and how coincident the setup actually is. The useful range of adjustment is in most cases rather limited, so starting with a M/S setup that is as close as possible to what you want with a straight 50/50 decode, or an X/Y setup that is as close to what you want before possibly tweaking things somewhat with an X/Y>M/S>X/Y plugin is one of the keys to goodness.
Consider that what most would think of as 'standard' M/S using a cardioid mid is
not equivalent to X/Y cardioids and
in no possible M/S ratio does it decode to X/Y cardioids. All standard two mic M/S setups using a cardioid or supercardioid mid decode to virtual X/Y mic patterns that have some degree of rear lobe.. but to my thinking that's a feature not a bug.
I'd think SonoOtoSound would probably want a supercardioid mid for his FX work, to help isolate the sound of interest. A shotgun mid is often used for film dialog work, but that won't sound as natural for non-speech FX sounds.