I know the guard feature was made for a scenario for the new Glossop Line DLC. I would like the developers to implement the guard feature on past passenger dlc routes in service mode. This can give the players to work as a guard in Timetable service mode. For suggestions to improve the guard feature is to have the guard make in train annoucements and have the passengers talk to the guard when he or she goes checks on their tickets. These improvements can add immersion to the guard feature and make it feel like your on a real passenger train.
If they do guard mode on past routes we need a guards door control panel on HSTs and the ability to walk from the drivers seat to the passenger seats through the engine room to check tickets. They would also need to get the guards panel working on 150s either at the staff door or the panel by one of the passenger doors in each coach.