Basically if you read the rules, it mention no exploitation of bugs, and this one is definitely a unintentional bug
1. You sending in a ticket makes me think of that kid in class who reminded the teacher to assign homework over the weekend.
2. You can't be sure that this is a bug, and not a feature because support has been wrong about a lot of things before. I'm not allowed to quote them here, but I've gotten the opposite response to the same questions more than once from support. They are volunteers, and only know what they have been told, or think they remember, even if that information is outdated.
3. If it is a feature, we should be thanking inno because there have been at least 5 threads and dozens of posts asking for this feature so that dead cities in permanent upgrade mode aren't totally useless.