I like the facial idea, well tbh more like a whole "auto-motion" than solely facial exprecion, but to get it a use, how?

Simple, like when people go away from keyboard.... its some troublesome when you wait long time explaining how run gona works to party members and when you finish you dont know who is away from keyboard and who still there, then woops you find out people afk once inside dungeon, and similar moments while doing infinity of other things like leves and Notorious Monsters and alot of other things.... Well an auto-motion putin people like in a state of sleeping or something warning us people is afk would be nice....

How to make it works?, like lets say when there isn't an input into controller of keyboard while 5~10 minutes then our characters enters into this "Auto-motion" warning us about he afk.

This idea could also works for alot other situations, but setin a perma facial gesture until you take it off to demonstrate to party members you're happy or angry doing certain thing, but this last idea is irrelevant i think.