All this talk about warriors dual wielding two weapons rather than using 1H Slash + Shield is pretty pointless imo. I have a warrior and then reason that I never lose aggro on him is because he dual wields AND BASHES. It's REALLY simple...
1) - Set up a bandolier with the two 1H weapons that you want to dual wield. Name it "Main".
2) - Set up a bandolier with the 1H Slash + Shield that you want to use. Name it "Bash".
3) - Set up a hotbutton that says following:
Line #1 - /bandolier activate Bash
Line #2 - /pause 3
Line #3 - /do <Bash#>
Line #4 - /bandolier activate Main