I just got off the phone with Benelli Customer Service - very helpful representative - we will see how well her suggestion works. First, Benelli had no reservations about sending me a replacement pad. The CS rep indicated this is the second call like this she has handled in the last week. Benelli wouldn't send me a spare pad; however, I was told I could order one through my local dealer.
I was told that the pads were shipped to Benelli with a "release agent" to assist with the assembly. Benelli recommends that a new owner with this problem clean the butt end of the gun and the replacement pad with rubbing alchohol. Once cleaned, the pad should be re installed using a silicone lubricant.
When I asked about gluing the pad to the stock, the CS rep didn't say yes and didn't say no - did indicate that once adjusted there was little reason to remove the pad. That said, I do have a concern that applying a glue to the pad would void the warranty.
Not completely satisfied but this is a reasonable response -