First I do not agree that deck operation happen in a vacume as forcefields and such provide just as good service in such cases. The Fire suppression system is designed to save equipment and to save life, modern foam actually allows a person to breath air but yet stops a fire by breaking it down on the molecular level removing heat, note older foam actually was designed to cut Oxygen out. The idea here is that equipment which would be lost in the event of venting it into open space is saved. Dedicted equipment is simply the modern Star trek equivelent of rescue equipment. As to Transporters being used a special recovery system is in the work thanks to a someone on the boards here who is still working the kinks out.