Another post indicates a distinction between USB wacom tablets, those that are plugged into the usb port, and SERIAL wacom tablets, those integrated with a machine/device.
your tablet pc, the lifebook 4210, as my Lenovo X61T, falls under the later category.
The best post I've found to date is this:
http://en.gentoo-wiki.com/wiki/Fujitsu_Lifebook_T4210-T4215#Pen_-_Wacom_Active_Digitizer
If the Gentoo specific 'emerge' and other commands can be translated over for a Slitaz distro and a working 'HOWTO' laid out we could place it at the end of this thread, or start a new 'SLITAZ WACOM HOWTO' thread somewhere else.