This is a subject that I have been battling for years here on the G. Almost all of the educators are in agreement on this subject and will tell you to never...ever...glue anything. What seems to be not valuable today could become so in the furture, or the customer might one day want to re-do it. In my humble opinion, nothing should ever be attached in a way that would not be reversible if needed. I'd say sew, sew, sew.
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Pat is the owner and creator of Attach-EZ Object Mounting Systems, a 16 year vetran framer, and Pres. of the North Central PPFA chapter.