I often edit and comment new users' questions with
Use latex (click on edit to see what I typed)
I wonder if it is possible to detect when a new user is posting a question without using latex, and show him a message about using latex, clicking on edit, and simple examples $\scriptstyle\sum, \int,\prod_{n=1}^\infty, \sin^2(x^a), \sqrt{2}, \implies \ldots$