I was personally disappointed when I finally noticed that my CHA based PDK vanguard had a much lower to hit with her shield than her sword because the CHA to hit/damage does not apply to shields.
I would like to see Cormyrean Knight Training modified to include shields. I think that it would make sense because PDK does seem to be made for Sword & Board that of they can use CHA for combat it would apply to both tools they use most commonly.