I played a game with Golem & Royal Carriage the other day, and it was well nigh impossible to determine whether I was Royal Carriaging my Golem or the second action called my by Royal Carriage. A better interface would indicate which action I were positioned to Royal Carriage (or passing on Royal Carriaging).
I suspect there are other actions for which this would be confusing with RC (Throne Room & KC come to mind).