Hmm, this is a very interesting question.
Let me see if I understand what you mean, first.
In essence, you're asking if Socratic can offer users the possibility of switching from students asking questions and contributors answering them, to contributors asking questions and students answering them, right?
I absolutely love this idea, to be honest, and I think that it's a natural progression for Socratic.
Socratic has no restrictions on who can answer questions, so many students are already answering questions and receiving feedback for their asnwers, in some cases.
You can always ask questions and answer them yourself if you think that they would make great learning material for students, but that's the closest you can currently get to what you proposed.
Although I admit, this feature would improve Socratic significantly!
Practice questions, or even practice tests and exams, would really be an amazing feature to have, but as you would imagine all these things would require "infrastructure" changes that take a lot of time and effort to develop.
All in all, I think that this feature will be available on Socratic eventually. Until then, continue to help students and make learning easier! :)