Installed my trailer brake controller yesterday. Downloaded AlphaOBD to find out the bluetooth OBD adapter I had wouldn't work with it. Then had another BTS owner message me about a beta version of TazerDT firmware that enables the brake controller. Today's I "updated" my TazerDT to the beta firmware z and sure enough to thebootik for trailer brake controller worked, and short of hooking up a trailer,bit seems all functions work.
As an added bonus, the 18.06 beta firmware also adds a pulse option for third brake light, so I enabled that as well.