I've weighed in on this topic already, but I wanted to ask other people's experiences as to what their RRs do when they DON'T bite, but feel the need to do SOMETHING. I've found that Oscar is very good at using his body to physically push people out of the way. He has on a few occassions also jumped up and pushed someone (once it was me! 
long story...) with his front feet as well (not the 'jump up because I want to lick your face' jump). I think he's well aware of his size (95lbs) and that it intimidates people. I personally think it's a rather fine alternative to biting in a situation where you want to drive someone away, and I'm glad he thinks this way first, instead of with his mouth...
A friend's male will do a couple of things: jump up and push away (like you mentioned) and also stand in position holding the person there and growling if they move. He's never tried to bite.
I was walking just before dusk with my two at an off leash trail that we hadn't been to in quite awhile and I had just released them when a jogger came through the trees and Xhabbo charged him without barking or growling but it was clear that she felt he might be a threat. The jogger stop, adverted his gaze and held out his hand to Xhabbo and she stopped, checked him out, sniffed his hand and came back to me. It was the first time she did something like that and I think we were lucky to have such a smart jogger help teach her a lesson. Trek on the other hand did nothing. I have no idea if he would actually be of any help if there was a real threat, although ya never know.
