All I've used was "ca_swim" and "shieldwall" really (plus adding the "warcry" to some units - I figure that does the "frothing mass aggression" thing sufficiently well, and "berserk" would be overkill), but I'll readily admit some of the stunts I've seen shieldwalled units pull slightly worry me. It doesn't help I had hardware trouble before I had the time to play much with them to form any sort of solid opinion, and although that's now done with (and the comp a spaceship compared to the old box...) I've yet to muster the energy to re-modify the whole thing and start playing again.