Works as described, but needs some work before it can be used in a functional workflow with other tools.
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. That seems to be the entirety of its action.
This works just fine as long as there is nothing else that taps or fn+taps does on your system. 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. 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.
What this app needs to truly be useful is some additional settings so that users can make it work with their other utilities.
• There should be a setting to suppress the tap from being passed forward. (Personally, I don't see any reason to pass the tap through anyway. If the idea is to turn the tap into a virtual keypress, the tap *should* die there. After all, real keypresses are not accompanied by tap events, so a virtual keypress shouldn't either.)
* The user should be able to configure the modifier keys that activate NumPad, so that collisions between NumPad and other modifier-taps can be avoided. (I use Karabiner to assign additional functions to the fn key, so holding down just the fn key for this purpose will sometimes cause other problems for me.)
* I would also like to see a command or hotkey to temporarily disable NumPad for a (user-configurable) set amount of time. In fact, hotkeys for enable/disable and mode change would be welcome period.
* Minor but annoying point: fix the incorrect English usage in the instruction window, and use a slightly more professional-looking font. Chalkduster really isn't a good font for anything remotely serious; it's barely better than Comic Sans.
In short, this is a promising beginning for this app, but it's not close to ready yet. Back to the drawing board.