If I only could to quit mac apps with a single click...
I don't see why you'd spend hours writing a system utility to close apps on a Mac that provides a perfectly easy to use keyboard shortcut.
Yes, so badly that I even wrote a small menu bar ("tray") utility labeled as "[ X ]". When clicked, it quits an app with the currently active window. But well, this is not an ideal replacement...
I'm just very used to quit an app when I'm done working with it, no matter how soon I'll need to re-open it...