If I was speaking on behalf of the RMT during a talk with GTR management, I would request the implementation of the following once DOO is in place:
-If the driver believes that closing the doors will cause someone or something to become trapped, they should leave the cab and manually lock out any affected coach, regardless of the resulting delay (it will simply be a consequence of DOO). The passengers should then be informed of the exact reason behind the delay over the PA system so they know the management is to blame;
-If the view out of any camera becomes obscured (i.e. due to sunlight), the driver will not move the train until a time when they can clearly see the entire length of the train on the platform. Again, the passengers will be informed of the exact reason behind the delay so they know who to blame;
-During key events, which attract many passengers (such as the Lewes Bonfire or the upcoming Eastbourne Airshow), all trains on the appropriate route(s) will have a Guard, in order to ensure that the high volume of passengers do not put themselves in danger (especially at unmanned stations) when boarding/alighting the train;
-Passengers should be provided with enhanced compensation if any delay occurs that could have been minimized had a Guard been on the train; i.e. if the train breaks down and the driver is left to deal with the fault, the communications between the train and control/the signalman, the passengers (and how they react to being stuck) and the rescue process single-handedly - perhaps the management should refer back to what happened in 2011 when that FCC train became trapped between St Pancras and Kentish Town and passengers evacuated themselves onto the track, resulting in the rescue process taking approximately 5 hours. Now, if a Guard was present he/she could have spent their time dealing with and communicating to the passengers (for anyone who isn't aware, the PA and A/C systems also failed), and the driver could focus on getting everyone to the next station;
-In the event of an accident, which leaves the driver incapacitated, if a MOM is not on site within 15 minutes (time does make the difference), GTR will be finned heavily and the money will be taken directly from the managers individual pay checks - that'll put a smile on Horton's face!
Please feel free to add anymore suggestions below.