Key themes are a big part of the new ergoemacs-mode. These allow more than one keyboard binding to be packaged but still use the ergoemacs-mode engine. This allows:

• Gradual ergoemacs-adoption
• Backward Compatability
• Sharing of your personalized ergoemacs-theme
• Keeping ergoemacs compatibility fixes such as:
  • Using the arrow keys in the terminal when Alt+O or Alt+o is bound
  • Providing fixes for known minor and major modes so they respect the ergonomic keyset.
• Keeping some additional ergoemacs features like:
  • Applying your personalied ergoemacs-theme everywhere

You can manually code your own ergoemacs theme. I am currently working on a simlper method to theme keys.