Different systems use different scales. For instance, I'm planning a Savage Worlds game, and they use inches as the base scale when using miniatures (which corresponds to yards, but everything else is in inches).
While it's a minor gripe, seeing feet popping up on the ruler tool can be a bit jarring when I'm trying to think in inches.
A way to change either the page's unit from feet to something else (like 1 inch == 1 inch instead of 1 inch == 5 feet) would be handy for different systems.
