Hi BigChief!
Unfortunately I won't be able to help answer if a button can be programmed on your Polycom phones to adjust mic sensitivity. We've found that our customers who standardize across a couple of headset models have an easier time knowing the proper volume controls, and managing the headsets is so much easier as well.
When it comes to a wired headset, you can get an amplifier that would give the users the ability to adjust their microphone control.
Let me know if I can help answer anything else relating to your headsets.
Thank you,
-Drew Merritt
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