While I can’t comment about the new Pro controller boards (but pretty sure the “F” silkmark is where it’s at, indeed), here’s a thread about everything Feedhold on the Shapeoko,
and of interest to you is the part about how Carbide Motion behaves. You can definitely use a physical feedhold button with CM, you will just have to push the button AND click start in the UI to resum after feedhold.
I’m as interested as @neilferreri in getting a good pic of the Pro controller, for later reference in the community for this kind of things that are not (yet) officially supported.