Please support enabling/disabling touch via a button by doing a "xsetwacom set <id> button <n> touchtoggle" or something more appropriate.</n></id>
Implementation should be similar as to "xsetwacom set <id> button <n> modetoggle" for switching between relative and absolute mode.</n></id>
I would suggest taking a look at xbindkeys. This program can run in the background and run commands in response to keypresses. Since xsetwacom is already capable of enabling/disabing the touchpad, this provides a way to have a pad button (which can synthesize keypresses) do it.
1) Install xbindkeys
2) Add the contents of the attached file to your .xbindkeysrc, replacing <id> as necessary.
3) Configure a pad button to press CTRL+SHIFT+T
4) Start xbindkeys and verify it works
5) Have xbindkeys start along with your X session in the future (e.g. add it to .xinitrc, .xprofile, or your desktop manager's list of startup programs)</id>
See also for GNOME Control Center https://bugzilla.gnome.org/show_bug.cgi?id=752039
Linuxwacom has moved from Sourceforge to Github. If this is still an issue please reopen this request there.