You could also dip for one level of Crusader or Swordsage, since the feat also makes Initiator levels stack with bard levels for Inspire courage. You'd slow a few other class abilities down but be more active in combats and have an increased damage and/or defensive output from the maneuvers and stance.
Other than that feat there's nothing I know of, and I'm a big fan of bards in general and the inspire courage ability specifically. If I'd seen it, I'd definitely remember it. It could be in an Eberron book or Dragon Magazine, but other than that it almost certainly doesn't exist.