[click170]

This seems like the kind of thing Apple will integrate into OS X in 3.. 2.. 1...

[e1ven]

I actually think it's somewhat unlikely that Apple will add this, due to their deprecating quitting.

They don't want you think about quitting applications at all, they want to hide that under the rug.

Making quitting more explicit (like this app) seems to do the opposite of that.