
Kriss
When I type (, {, [,
Editorial automatically close(by typing ), }, ]).
I want to use same function for $, since LaTeX code should be inside of $ and $.
But there is no option for bracket matching.
I think there would be more demand for custom matcing, so It would be great if this option is added. 
Kriss
I'm using mathjax for LaTeX math rendering support by using custom template.
$\int _a ^b f(x)dx$  > beautifully rendered form of integral from a to b f(x)dx
here is my template headerscript code.
<script type="text/javascript" async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.2/MathJax.js"> MathJax.Hub.Config({ extensions: ["tex2jax.js", "TeX/AMSmath.js", "TeX/AMSsymbols.js"], jax: ["input/TeX", "output/HTMLCSS"], tex2jax: { inlineMath: [["$", "$"], ["\\(", "\\)"]], displayMath: [["$", "$"], ["\\[", "\\]"]] =}, "HTMLCSS": { availableFonts: ["TeX"], preferredFont: "TeX"}, "showProcessingMessages": false, "messageStyle": "none" }); </script>
In the first preview, It works great.
But when I add some math equation and preview, the added equation is not rendered.
So I have to reselect my custom template. Then Editorial reload my document, so problem is solved.However, I have to tap template  myCustomTemplate every single time when I want to show my document.
So I suggest new option, "always refresh preview." (default should be off.)and It would be helpful to add refresh button and keyboard shortcut(CMD+R) in preview mode.
then whether the option is on or off, users can refresh preview contents if needed.