Map middle of Magic Mouse to left button

I want this to do -one thing-: Map the middle of the Magic Mouse to the left button, in particular so when my finger wanders away from the left side to the middle, the Mouse Does The Right Thing.

But I've been unable to figure out how to get that to work.

Am I missing some sort of configuration setting?

It seems others have observed a similar issue, but I don't see a "how to" or a "that's a bug, we're working on it" response. Thanks in advance for help/pointers.


I just installed 4.073, and there's no change. Clicking in the middle region is still not generating a left mouse click. I notice that the "Live view" correctly interprets the middle region as 'left', but it's still not generating the left click event.