I ran into a lot of Tanks and Monks that forgot to use Oath and Fist Stance.so i simply said in chat :
"Oath"
"Fist"
and they'll use them in few seconds later.some of them even say thanks to me for reminding them.

I won't bother tell NIN though since i can't remeber those 2 skill name.Scarlet's Kiss and Wasp's Whisper ? whatever ...