In addition, I have added a device named Speakers. Inside that device I have the individual commands to raise and lower volume by speaker, including the subwoofer. (.5 db increments) For example, front right would be FR+ and FR-. Really simplifies the whole calibration exercise by having the individual commands right there rather than buried in a menu somwhere. Also - I have added SUB+ and SUB- commands to each of these devices - Satellite, BD DVD, AppleTV, PS3, CD and Reg DVD. That way I can adjust the sub on the fly without leaving the device. These examples only scratch the surface for things that the Harmony can't do.
I do some of this with my Harmony 880