I suddenly paste in stuff from the clipboard and stuff gets moved around so It looks like crap. Now in Gnome 3 there is this great extension that disables your Touchpad when you have an external mouse connected.
It can be turned of in KDE too (somehow
But I have gone lightweight lately and droped them both for standalone Openbox Window Manager.
So here i am writing cryptic %&#ApflStru?dl posts copying and deleting and moving things around because my wrist always touches the Touchpad.
I have a Synaptics input driver, as do most laptops, so this command should work on most laps:
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xinput set-prop 13 "Device Enabled" 0 And oh joy - your Touchpad is disabled
  Now this is the lazy method it can be set with palm detection so that it is only disabled while you type. Maybe I will get around to that too -some day.....
Anyway in Openbox we have this great autostart file ~/.config/openbox/autostart
so I just added
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xinput set-prop 13 "Device Enabled" 0 &So that the Touchpad is disabled every-time Openbox starts (I always use an external mouse with a mini dongle). The observant reader might have caught that it is not a good idea to activate this command without an external mouse...
Or you can simply type the command every time you want to disable the Touchpad - it will be back when you log out and back in again.