I found the easiest way with a controller is to use a macro, and if you need to initiate the Battle Regiment, use the menu button, if not, no worries after you hit the macro.
here's what I use:
/ac "youractionhere" <t>
Just be sure to use your buffs before hitting the macro.
Simple, no muss, no fuss, one button (two if you are the person activating the regiment).
Edited, Jan 3rd 2011 5:08pm by Restyoneck
"Don't take it personally man, white knights would eat a can of **** if the label said SE on it. If anyone dared mention that it was not a good product, they'd just argue if someone can't appreciate the subtle nuances in the ****, they should just go back to eating lolrealfood, cuz the devs prolly know more about canning food than they do."