I think one missing piece is the ability to position the PS plots somewhere other than the center of the page. Even just a "lower left" checkbox might help.
PCB does emit a header in PS output, if there's something missing it should be easy enough to add. The other option is a gerber to TIFF converter, might be able to find one of those on the 'net. Yet another option is to volunteer to add raster output to PCB ;-)
