Please take a look to the following patch proposal to /usr/bin/dexconf. It generates proper wacom configuration whenever /dev/input/wacom exists. If xserver-xorg-input-wacom is installed and /etc/init.d/xserver-xorg-input wacom is run, before configuration of xserver-xorg, then this could be consider a proper fix. Or else dexconf could be run by the xserver-xorg-input-wacom post installation script.
Please take a look to the following patch proposal to /usr/bin/dexconf. It generates proper wacom configuration whenever /dev/input/wacom exists. If xserver- xorg-input- wacom is installed and /etc/init. d/xserver- xorg-input wacom is run, before configuration of xserver-xorg, then this could be consider a proper fix. Or else dexconf could be run by the xserver- xorg-input- wacom post installation script.