Skimming through FUSS, we find:
/* Outcast flag setting removed by Narn. It's useless now that deadlies
remain deadly even on being cast out of a clan.
/* if ( clan->clan_type != CLAN_GUILD )
As for outcast_time, which is in pc_data btw, it has no apparent function other than being saved and loaded on the pfile.
So with regard to AFKMud, and indeed it appears SMAUG in general, those are utter wastes of space. Good find