I've never seen graphics rescale when I change my page size.

Opposite to what was originally asked, how would one force objects to scale with the page when the page size is changed?  I see mention of a viewBox attribute.  Is that something that is only available through manual editing of the XML, or does Inkscape have this feature per object?  If Inkscape isn't capable of doing this (yet), could it be a useful feature?

- Tony