Personally I agree with Michael. Somehow controlling the flow of fare paying passengers, and people just passing through would be a nightmare, and impossible to police. Just opening up the barriers and letting anyone pass through the station for the next few months would be a nightmare, and not a responsibility that should be laid at the feet of the current station staff.
Im sure if you have a reasonable suggestion of how people just passing through the station could be managed, maybe the station etc could consider it.
If the bridge was like the one at Penge East, and not within the confines of the station I would say it would be acceptable and expected.