I noticed that Dvorak is a keyboard layout option, but sadly there are no lessons for it. Would it possible for dvorak lessons to be added?

Lessons are hard to create, because you have to create a lesson structure and then you have to find words and sentences which consists of only specific characters. It's a lot of work.

We plan to develop a platform where users can help to create keyboard layouts, lessons and to translate the software. I hope this way we can offer some lessons for the Dvorak layout some day. In the meanwhile you can use the lessons for the QWERTY layout. You then you may have to put aside some keys from the beginning. So it's possible to use the Dvorak layout but at the beginning it's more difficult than with specific lessons.