¿How does the Blender User achieve a shortcut for custom operator in Pose Mode?
An operator was created and is functional for the past hour or so. A Shortcut Key was desired. The operator name appears in [pose mode] menu Pose. Operator use with the mouse is successful. Attempt is made to create short cut with the Add Shortcut menu depicted below. Key Binding does not appear which is a problem. Key Binding = Shortcut in this description.
Other investigations, attempts and successes
Key binding in [object mode] is successful. Operator use is successful in menus. Specials Menu and Python Console and Python dir command.
Key Binding attempted in [Pose Mode] creates Key Binding in [Object Mode]
Click image to see larger original size.
Add Shortcut depicted in the image above.
User Preference image above.
Object Mode with Short Cut. Image above.