Please consider adding an option, such as "/convoystart 60", to override the config file/300s default.
Consider enabling the bradleys to attack simple wooden barricades/etc that stop the convoy from moving. Possibly a configurable option in the json (ClearBarricades: True/False).
Consider an option to start the convoy at the admin's current position (can require to be on a road, if mod logic requires it.).
Consider adding a startup option for duration, as well, such as convoystart 60 d 3600 (to start the convoy in 60 seconds, for a 1 hour (3600s) duration. Again, to override configured defaults, when desired.