And it looks like I'm going to have to search just to find Slackware 12.2 to download; they seem to be at 13.0 now
Roland, it's not that involved for a few system resources. Put the extra slackware packages in /boot/packages.
upon boot up restore any configuration files from your /boot/custom/etc directory (via the /boot/config/go script)
Install the packages upon boot with installpkg.
If you edit anything on the system's ram disk, make sure those configurations are backed up to /boot/custom/etc.
It's not the perfect solution but it works.
Other choices which are more involved. uncompress the ram disk image to a hard drive folder.
Do installpkg's of everything you want to install into the hard drive folder.
Repackage the hard drive folder back to a bzroot image and place on your flash drive.
I usually go way of the first method. Then any upgrades do not involve the work required in the second method.