Ahh cool 
I think that this can be useful for some users, but the problem is that one hits a wall very quickly with this kind of support, and I think that most kinds of use-cases that would benefit from this level of math support are elementary enough that the math could be written in unicode, or in code blocks…
For this reason, I wonder if users would be better served by things like syntax highlighting for code, which can be done in a very satisfactory way that scales to (almost) arbitrarily complex use-cases.