MIGHT be a good add-on, BUT:
* Comes with no installation instructions at all. No README. Nothing.
* When you go to the Dev's web page, you're informed that it REQUIRES Simbl.
Simbl *used* to be a good thing, but Apple is strongly discouraging InputManagers now, has been since at least 10.8. No docs, and SIMBL. Those are 2 red flags for me.
Sure this Dev might be "overworked" -- but the first rule of DevClub is you MUST have a README. The second rule of DevClub is....