That's a very good question. I had plans to add major and minor pentatonic scales until it became clear that they way they are used, especially in rock and other blues based music is a subset of dorian modes. There's some real insight to be gained, especially with regards to harmony, or more practically, what chords you can play against a major or minor pentatonic. It's a lot more than one would think!

So, to answer your question, I'm not going to add pentatonic scales, but I do plan to record a video showing how GD can give you some really cool insight into how they work harmonically.