As you describe yourself as a dispatcher, I'm surprised you'd make comment condoning about all sorts of things around aircraft doors. I would not want to on one of your dispatched flights!
Aircraft doors are by definition emergency exits, and as such they should always be kept clear, just in case of such an emergency, which often do happen without any warning!
I was cabin crew on BA900/3JAN64, G-APFB, a 707-436, when we had a fire on one engine taking off from DEL in the middle of the night. The aircraft engine extinguishers did not put out the flames, but the airflow did the job in the end - it was not a pleasant experience. Needless to say on my aircraft there was absolutely no garbage around any of the exits!
Not sure if you dispatch 747s, but their doors can open in flight, but only just the first inbound few inches of the normal opening. They can be operated in flight in some cases of fire on board to help disperse smoke, etc!
Per Ardua ad Astra! ........ Honi Soit Qui Mal y Pense!