Typing about: in the location bar should give autosuggest options for about:home, about:config, etc. This should especially be true if the pages have been visited before, but I don't see why we don't suggest them even if they haven't been visited before. This becomes more useful now with more pages like about:addons, and about:preferences which are human-readable and will be accessed by about 20% of users. (many of whom won't type in the address, but may after using these pages often)