There isn't really any easy way to accomplish this. Inkscape has a toggle for anti-aliasing in Document Properties since 0.91, but that only affects the display and not the export. I don't know if Ponyscape even has that. If you really want a render without AA, you can try following this:
graphicdesign.stackexchange.co…Refer to hellocatfood's answer talking about shape-rendering. You'll need GIMP to do the actual rendering though.
Alternatively, the latest development versions of Inkscape do have an option to export without AA.
inkscape.org/release/inkscape-…