Well. I couldn't find any definitive information on the net, and none was forthcoming here, so I set up the standard 1.2.3-RC1 installation as described above. /tmp and /var are on RAM disks, so it looks like writes to the CF card are minimized, at least. And, it appears I still have VGA, should that be needed. At any rate, it's working well (< 10% CPU @ 12Mb sustained download; < 20% with three active VPN sessions + streaming video), so I can live with it as is. Still interested in the specific differences between the embedded image and standard install w/embedded kernel.
RH