Please add drawing to the digital practice tests!

I would love to be able to draw on the digital tests, especially in the math so I can graph functions etc. It would also be useful in the reading/writing test because then I could underline parts of the article in addition to highlighting important text in the tests that I think are useful for answering questions. 

Since we are able to write on the actual test, and since Khan Academy has a way to draw as part of their other general skill practices I'm rather surprised this isn't already a part of the digital practice tests for the PSAT/SAT. 

Hope this becomes an addition to these great practice tests!