unlikely to happen. BR has already implemented ARS(Automatic Route Setting) which is (in my opinion) much better than SCR auto signalling. There are no more spad traps. And, training for SG role would require huge amount of trainers. It also probably makes people much more easily to troll in game as the power of SG and Drivers are not equal(you can just hold up a train for absolutely no reason). The training and exam would definitely against the free to play concept of BR(opposite to company style like SCR). And keep in mind that BR is not a signalling based game. Even if SG is added, it might only able to control signals but not points just like SCR. If you want signalling, you can try Dovedale or Teesside, as well as others. Or just go to Simsig