It would be nice if krdc would use the system's keyboard layout as default. Everytime I make a new connection I have to change it from US-english to Danish. Reproducible: Always
You can configure a default for any new connection per protocol in KRDC settings. Does that help?
I never noticed the per plugin settings although I've been using KRDC for many years - it's a bit hidden. It would be really convenient to have a button in the new/configure host dialog: "Set as Default for RDP" (if RDP connection) which would set the settings as default. Could this be done? About the keyboard layout I think it should automatically set the keyboard layout to the one your computer is using. What is the scenario for having it always on US?