Let's say you check your phone 15 times a day. That would be over 100 unnessecary(SP?) clicks a week!
It's not the amount of work it takes to click the Home key, it's just that it should work that way. It's called a HOME screen for a reason, the software should already do exactly what he's asking, revert back to Home screen every time it's turned on.
To answer your question though, I've not seen anything to do what you are asking.