Sounds like a great solution. Works for both the Mk1 and Mk2.
As long as it was context-sensitive (i.e., only when in the playlist menu), it would be perfect. I don't want to lose the info-screen toggle, as I use that one a lot.
This opens up other possibilities for extended button interface stuff. If the press-and-hold funtionality of other buttons was context-sensitive, you could do a lot more with the front-panel buttons.
Although, making the UI any more complex would be a bad thing, of course.
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Tony Fabris