I just purchased a 2014 FLS. It has integrated brake and turn signals. Is it possible to add a brake flasher such as "back off" or others that would work properly. I was thinking of adding a lighted plate holder in order to gain the flashing brake light. My research has come up nil, all the control units I can find say they won't work with integrated lighting. I'd like to be more attention grabbing to the rear when stopping or stopped. Any suggestions?