Shoulder tackle. I know this skill would make tomahawk pretty useless for a number of situations but I feel like shoulder tackle fits the warrior playstyle so well that it not being cross-class is a huge letdown.

Invigorate. Yes, I know WARs don't share lancer abilities and we should structure play around conservation of TP (not to mention this gives peon more use) BUT I'm already getting to the point on fights like T4 that I'm fighting to take it easy on my TP use and if Square chooses to implement longer marathon-like battles, WAR and WHM are going to be the first ones running on fumes.