@novapaddy never said you were a complainer, I understand your logic and what you would like, as I also understand the side of the developer that needs to do a bit of everything. To me, more important than showing the reasoning behind the CIR calculations and such, would be to review their GUI organization. Mods/Assets can make things grow so much, they should probably think about a more flexible/changeable GUI with a Library-type of organization. We all have different cares in the end
What I'm saying is, we all have our quirks with the game, and I'd rather bring them to the moderators/developers in a different way. They tend to be a lot more responsive if you create something like a use case, or a more structured example than "i need to see the logic behind the happiness level". Of course what you want is, in essence, the way they calculate the happiness of each zone, and I kinda doubt they'd release that to the open. But maybe you can suggest more stats available... For example, "if you moused over the happiness level, there would be information of what's the most "pressing issue", or what's the most comon reason for them not to increase happiness. Could be transports, services, crime, etc". This would be something that they'd probably understand better, and could possibly be added later. See what I mean? Hope this helps you.
Also, as for the B/Del, I get what you mean, but I changed the whole thing, and while the delete is less efficient, it's easy to remember, and releases more of the keyboard to make quick calls to statistics and such, in a followed manner. To each its own.