Thanks for the feedback!
So, I’ve avoided adding $ and $$ for a couple of reasons;
I think that backticks are just better for this, since they already indicate changing the current “mode” while writing, and the dollar character itself is both arbitrary, and is much more likely to be used in both technical and non-technical writing.
It’s also more expensive to parse out a new delimiter just for math/latex than it is to re-use the existing backtick ones.
That all said, $/$$ is much more common, and should be supported for portability. If I can add them to the parser without too much impact, I’ll add them along with a separate setting to enable them.