Tracker Pad: Activation Button

Mouse Tracker Pads are essential in some scenarios but also a massive pain in others.

When typing - I frequently end up moving the cursor or copying/pasting when typing due to accidental contact with the mouse-pad. It is even happening as I type this.

Have a button (bottom-left - perhaps another bottom-right for Left Handers) that if pressed (like a SHIFT key) enables the pad, but otherwise leave it disabled - better if the same button could also be latched-on (like a SHIFT-LOCK key) and off.

My experience is - if I am using the mouse pad, my non-dominant head is not doing anything else - so it could be used to activate this button without adding much overhead.

Or maybe have a software solution - where (say) CTRL key (etc) could take on this role. (CTRL needed to activate mouse-pad, double-tap for Latch on/off?)