It appears that the comments show up on the top-left of the animation window after the algorithm has finished being executed.
You can show and hide text comments anywhere you like in the move sequence. Example
And am I wrong in that it doesn't support contiguous inner layer block turns of any kind?
For a 4x4x4, you can do m. Example
If there is enough interest, we might think about supporting other inner layer block turns in the future. You could also use the s modifier (followed by a cube rotation). Example