First off I wondered why too, but the more I think about it the more it makes sense, although I cannot give a definite 100% answer.
My logic to it is that anything to do with port settings etc is a more 'Advanced' section to edit, and so put in the 'Advanced' dialog. The IdentD port isn't placed there because there is very rarely a need to change the port number. DCC default ports are changed all the time though due to Firewalls and routers etc etc.
Don't worry too much though, just like every other time, if you leave it for a couple of days you'll get used to it. Think of it like a pair of new shoes! Feels a little uncomfortable at first until their worn in. As someone once said, "GUI changes get the most complaints" - There's probably a big psychological reason behind this, however, it's just because people get used to something and then it's changed, and not everyone likes change.
My 2 cents.
Regards,
