change shape function does not work in feed back master

I want to use a call out instead of the generic text box provided in the Feedback Master.  The "change shape" button is dimmed when in Feedback Master and becomes active when in base layer. I have 185 slides with 3 feedback layers/slide.  It's incredulous that I have to actually go in and touch every feedback layer to change shape.  Please tell me I'm wrong, or there is a work around? 

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