undocumented - What does the "ScalingFunctions" Method suboption of Graphics do?

Some plotting functions produce a Graphics with a "ScalingFunctions" suboption within the Method option. What does "ScalingFunction" do and how do I use it? Can I use it to transform arbitrary graphics in a non-linear way?

Example:

g = RegionPlot[x^2 + y^2 < 1, {x, -2, 2}, {y, -2, 2}];

Options[g, Method]
(* {Method -> {"ScalingFunctions" -> None, 
   "TransparentPolygonMesh" -> True, "AxesInFront" -> True}} *)

Note:

This doesn't appear to be the same thing as ScalingFunctions.

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