I have been using the SAT Dashboard for my first SAT score and now during my studying for my retake. I have a couple of suggestions that I feel will make the SAT practice questions more in-tune with the actual test. 

I like to highlight parts of a question while taking an online test because it helps pinpoint what I need to do. By providing a small feature that allows highlighting the question on both Math and English sections I think it helps with the immersion. When I took my first SAT we were able to use a highlighter tool for both questions and answers. 

Another feature I think would be a good addition is the notepad tool. Although some people do not use this feature on the actual test I used it so much to document how I was understanding the text in relation to the questions. It was more helpful on the Reading section compared to the Writing and Math, but the option should be there.