Yalfoosh yeah, special delimiters limits further improvement of the extension and brings so much complexity. I feel like they don't fit well into community platforms, all others out there using BBCodes-only and it is simple enough. Also, they're more reliable and faster than special delimiters. I had to perform so many checks on delimiters to see if they're special ones or BBCodes (this class is there only for special delimiters as well as most of the functions in this class). We have Overleaf for our articles so let's keep it simple here.
I will leave 0.2.x as it is, feel free to inform me about any issues that you're experiencing on 0.2.x and I'll see what I can do.