I prefer to disable the trackpad on my macbook when an external mouse is attached via bluetooth, so that I don't accidentally hit it and to discourage me from using it, which I find un-ergonomic.
However, sometimes I'll move the macbook to the sofa or another room and forget the bluetooth mouse. In those cases I'm stuck with no mouse controller at all. So I would like to be able to re-enable the trackpad. However, I find that hard to do, using just the keyboard.
This is how far I've gotten:
It's that second checkbox I need to toggle, but I can't find a way to manipulate it without a mouse. Can it be done?
I actually did manage it using "Mouse Keys", but... mouse keys are quite annoying, since they disable the regular action of nine buttons on the keyboard. I also tried "Head Pointer", which is even more annoying in my opinion.
So I'm hoping there is some way to use the keyboard to do it, I might have overlooked.