From Smite to Song Feat

I was looking for a replacement for the Smite feats and found this feat. It replaces Smite Evil with an Inspire Courage effect and I see no reason why it shouldn't work with Smite Good or Smite Infidel. Especially Smite Good since it's useless for 99% of the modules out there.

It's a feat I've looked at a number of times but the effort to do it hasn't been worth it (and there are serious balance concerns about it as well after all I've done for Paladins).