:/ That's one workaround I thought of, but somewhat tedious. Maybe a good time to start learning python scripting. For anything architectural I couldn't imagine not having exact control over uv mapping.
I don't know if this is useful, but might be if you look into python, there's something called texture space you can get to in the bar on the right you go "object > display > texture space" or activate and manuplate with shift-T. I've no idea what it does but could be a good way to keep track of the bounds of objects you…