I disagree, OpenStreetMap isn't a city planning tool, nor a tool to report urbanism problems to city official. OSM is and should remain a tool to represent the world as it currently is. It is not as a personal database for organisations and their own needs. Those tags are of very little usefulness for the OSM community. Also, they clutter the editor. 

Imagine if all organisations started to add their custom tags like this, it'd be really unmaintainable. 

I'd suggest working on a solution that doesn't involved diverting an open source project for the needs of you and your partners. 