AIUI, the All-American Freeway is state-maintained, including the part within Fort Bragg (the freeway itself might be open to the public, but with access restrictions once you've left the freeway -- kind of like I-5 through the Camp Pendleton Marine Corps base, which has one exit serving only destinations on the base). But AAF's route number is in the 1xxx secondary routes, which are not included in the existing NC state route set.
I think we make occasional additions to the named freeways set, subject to interest by the state's maintainer and input from other team members. One unnumbered freeway in California (the Westside Parkway west of Bakersfield, which may become part of a rerouted CA 58) has been suggested for addition, and I'm leaning to adding that route. I would be cool with adding the All-American Freeway in NC as well, but that's not my call, especially since it intersects with several existing routes, and AAF maintenance would have to be coordinated with the other routes.