I think it would be a good idea for users to be able to set the flair on their own posts.
It would still be up to the mods to choose and design what flair is available.
Right now if a user posts something that is NSFW or NSFL, it goes unlabeled until a mod notices.
Edit:
Ok, it is possible. It is an option that can be turned on or off per sub. Thanks devs, you added that so quick, it was there before I even asked.
I am going to enable this option on music subs once I get around to sorting the flairs out. I wanted to have flairs on my music subs on Voat, but adding flairs required me to listen to the song if I didn't know what it was, and that was too much to do on top of modding ModernPowers and other stuff. Letting people flair their own music leaves me free to do other stuff like working on CSS.