Whilst I appreciate the body language bit, was never a fan of him using it to become Cassandra Cain. Just because he can tell when a blwo is coming doesn't mean he's going to be able to react fast enough o get out of the way. Now being able to tell when someone is lying might be just as useful and less obvious an application of the power.
And the X-uniforms aren't bulletproof at this point. It wasn't until IIRC the Muir island X-Men that it's mentioned that Forge had upgraded them to serve as body armour.