This is one of the best and most original feature request ideas I've heard in a long time.

The only thing I'd add is that it should be a selectable option. Because 1. it would take time to execute, effectively increasing the amount of time it takes the player to respond when you choose a playlist, and 2. it would use up one of the three existing bookmark slots, leaving the end-user with only two that he can personally control.

But other than that, it sounds like it would actually be pretty simple to implement in the player software, and it would have benefits that could extend to the other Rio products.

Also, it could effectively give us an "Undo" command if we wanted to treat it as such. Really, it's the same thing. A rose by any other name and all that.