The back button does not close an app. It puts it in the background, still running. Menu>Close closes an app.
When I upgraded to 509 I had "My Favs" for about a minute, then it was gone. Can't find it anywhere on my phone now. 'Been about two weeks. 'Don't know what I did to make it go away.
The problem with changing a theme is the fact then now all other items and shortcuts are set by default. So I have ot move items from apps to the home fodler, etc.