Comment 10 for bug 144334

As it is, adding files to /Music (the default Music checking location) and then opening Rhythmbox DOES get them discovered by default now. I'm pretty sure this has been the case for a while now.
Having an option available to decide whether or not to do this scanning for new files added on rhythmbox startup is miles better than having no choice in the matter. I would strongly advise against removing customisability.

With the desired behaviour already implemented by default and suggesting removal the option of the ability to change this behaviour, i move that this bug is invalid.