I think it would be amazing to have another fire station! Most cities don't have two stations. This would make EM4 more realistic in ways. I think it would be a great thing to have. Looking forward to the release of this submod. Hopefully you'll get permission to add a 3rd fire station in.
Depends on what city this is being modeled after. Almost every city in Southern California has multiple fire stations within their cities. I live in a medium sized city for the LA area and there 5 fire stations here and one training facility with a helipad for the PD's helicopters.
-d