I don't know if this bugs makes senses now, because in openSUSE 13.1 there's the new kcm-touchpad package, which substitute synaptiks into handling the touchpad and disabling it when an USB mouse in plugged in. And it is doing very well its job. Also, when kcm-touchpad is installed it uninstalls synatiks. Maybe it just concerns to older versions of KDE that don't have the new kcm-touchpad.