Here’s an example of an embedded pre-made Desmos graph in which I tasked students with identifying limit behavior at certain points. I also used LaTex code to type the limits into the equation editor. Actually I copied it and pasted it after the first one, then just modified it. Feel free to explore the embedded desmos, and use of LaTex inside the equation editor.
I think I’d like to see maybe a drop up menu for symbols like ° π ∠ θ etc. I don’t think adding them directly on to the equation editor would be beneficial because it would take up valuable real-estate. But as a single (symbol) button I think it would be useful. I use limits a lot but most people won’t. Most people probably won’t use theta θ either.
That’s my opinion.