Since Data Elements and Extensions are needed to build rules, how about moving the Rules tab to come after Extensions (see yellow arrow in the screen shot below)?
I'm interested to see the feedback. Internal debates continue about whether to cater to the first-time user and arrange the Nav based on the order you do things when you first setup a property or to arrange it for frequency of use on a day-to-day basis. I'd love to hear from folks what they prefer.