Units of distance and scale are meaningless and relative to nothing. Call them meters, inches or lightyears, it affects nothing.
The only thing that it *does* affect if force and velocity calculations by the physics engine. But since **you** control this all you have to do is take it into account. The only hardcoded place where you need to adjust the force is under gravity settings, because all the other physics settings are done through code by you yourself.
So to change the units of measurements, pick a word for how you call them (mine are Joshuas, plane that is 9 square Joshua). Now decide what the scale of this unit is compared to meters (mine are 1! :p) and divide the gravity by that. From there on it's just a matter of imputting the right force and velocity variables.
So the reason all you can find on changing measurements is changing gravity is because changing measurements is useless, as they are meaningless units. They are just used by the physics engine, so change how it uses them.
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