I'll ask a build peer to review this.

The only issue that will arise from this switch is that when you go to Settings -> Sounds -> Ringer to change your ringtone, the first time you do this in 2.0, it won't select the radio button for the ringtone you already have selected. I think that's pretty minor, so I didn't bother trying to migrate that (which would be really hard given that the ringtone name is localized!)