If you use something like BetterTouchTool to modify tap events, those taps will still first be processed by NumPad if made with the fn key pressed-and if fn+tap has not been defined as a specific special event on your system, the tap event is treated like a regular tap event. If you have tap-to-click turned on, as I do, that tap gets passed forward as a click event at whatever location your cursor happens to be at that moment. This works just fine as long as there is nothing else that taps or fn+taps does on your system.
That seems to be the entirety of its action. What this app appears to do is intercept trackpad taps while the fn key is pressed, map the location to its virtual keypad, send the appropriate keypress, then pass the tap event forward to the next listener. Works as described, but needs some work before it can be used in a functional workflow with other tools.
