Open a new window. Use configuration A.
Switch to configuration B. Modify “Properties for All Configurations” (e.g. change a shortcut key).
Switch back to configuration A. Use the changed shortcut key.
** The changed shortcut key is not yet being used in A.
Similarly,
Use configuration A first.
Switch to configuration B.
Delete configuration A. Add a new A. (Or just Reset All configurations.)
Switch back to configuration A.
** A is using old properties.
The configuration properties should be reloaded after the modification.