I really wouldn't worry about it. It's quite a rare thing to use up ten uses of bardic ability in a day when they have a duration based on concentration. Boosting morale for an entire battle is a single use. Thus, unless you have to switch abilities over and over to counter fear effects or whatnot, then you're not likely to run out. Even if you do run out, there's the spells! Bards get a boatload of spells to boot, including cure wounds!