In testing out 3.6 I noticed what I felt to be a couple simple features lacking in the Nav Menus. With the new accordion-based UI it makes it easier to simply hide and open a short list of pages,categories,formats, ect instead of scrolling down what could be a long clunky list, GREAT! However, the "format" tab does not offer the ability to add a "standard post format" to your menu. If I want to create a menu of post formats like I would with categories or anything else for that matter I have to assign a category to all my standard post formats, then add all my formats to my menu and one category, doesn't make sense. A standard post format IS a format right? Shouldn't it be available to add to your menu instead of creating a work around situation like this.
Second is why can I only open 1 accordion tab at a time. If I want to add a page and a format and a category to the same menu why can I not open and close as many as I would like to compare and see my options... shouldn't there also be a "open all/close all"" button. I love the grouped accordion style UI and know it will help cut back on the size of the nav menu sidebar (especially when using an e-commerce plugin like woocommerce that adds several menu categories to this page) BUT, being able to have multiple tabs open at the same time is something we (designers/developers) have been use to since the addition of custom nav menus. I do believe this area needed an overhaul and it is going in the right direction, but I dont believe taking this away is a plus. I love WordPress, and their dedicated team so know this is not a bash, just good old constructive criticism. I want WordPress 3.6 to result in an amazing UX. A good UI creates a good UX, but im sorry the new nav menu UI is not giving this designer a good UX.