I was recently informed that this feature was not working in C10.
Interestingly this appears to be the first major issue with the change in the IDEs target framework from .NET 2.0 to 4.0
In this case it was because SetWindowsHookEx fails under the 4.0 framework when it doesn’t under 2.0 http://stackoverflow.com/questions/3567758/setwindowshookex-returns-0-when-compiling-for-the-net-4-0-framework-in-32bit-ma
In case you are curious, this is the addin I am talking about: http://clarionaddins.com/addins/EditorExtras.html
I have not uploaded an update to this to all purchasers yet as I am still trying to give everything a more complete test but please, do let me know if you want the test version and I will happily send it over!