Not in a million years.

There is no such thing as a perfectly accurate touch pad "click". Most people (myself included) tend to see their finger slip (even just a millimeter) to the right or the left when pressing down to click on a touchpad. It leads to go knows how many times that my cursor in the middle of typing has suddenly jumped to a completely different line. In fact, it's why they implemented the option to turn off the touchpad when typing.

So now let's introduce ANOTHER use to that part of the keyboard. Not only do we have to deal with a wandering cursor, but we have to deal with random spaces popping into existence every time we try to scroll.

Screw that.