We have more commentaries coming though. Dilly's been taking fan requests on the side (doing King Ramses' voice, and doing animal impersonations) - I know how important it was for him to incorporate themes into almost every episode of Courage, and asked if he'd discuss any particularly poignant/significant episodes and explain why the theme was important to him, how the story was built around it, and what message was he wanting to tell. He said he plans on doing that in future commentaries.
He also thinks this may have something to do with why Courage isn't getting rebooted. Working those themes, undertones, and messages into Courage really gave it more depth and subtext compared to most other animated series out there, but it doesn't seem like the people at CN are interested in that kind of storytelling.