flywheels.. weighting your crankshaft

I was wondering if having additional inertial-mass (other than a spec.-propeller) mounted to a model aero-engine, might affect certain aspects of performance. I realize that a throttled engine's response-time would be negatively affected.. but might it provide for "smoother-transitions"?

Model aero-propellers don't have much mass. They induce a "load".. but not much of an inertial one. A spinner is a flyweight.. but most are insignificant contributors to inertial-weight. The Higley "Heavy-Hub" is a better example.

I'm remembering the old "hit n' miss" engines. They weren't 2-strokes.. but the "inertia" principal is what I'm thinking about here.  

Could flyweighting your engine's crankshaft "buy you a few strokes" to avert a flame-out?

I'm not an "engine guy".. but I do enjoy learning more about them.