I typically have name display of non-friends and non-party members turned off, because it clutters my screen and really makes things less immersive, but I find that I miss a lot of my FC members when running around because of this, since there are no FC-specific settings under Character Config > Display Name.

I only have a few people from my FC on my friend list, and so everyone else simply doesn't show up. It'd be nice if the Display Name menu had specific settings for FCs - it does have pretty much everything else under there so I can't imagine it'll be difficult to implement.