It would be great to post an image of what this looks like in a couple code examples. I've been working on this as well, primarily because I haven't seen a syntax that gets it right, usually it's rushed or sloppy, and some just really get the syntax wrong. with off false positives appearing all over.
I think the problem is also vim which doesn't have a really great way to do syntax highlighting. At least not an easy way. Highlighting is all in a single thread and blocks which makes it slow on large files and the regular expressions seem fragile. I think a better way to do syntax highlighting would involve a lexer and bison instead of regular expression hell.
Surprisingly this file is pretty simple. The learning curve for writing syntax files is definitely something though.
Thanks for the feedback, I'll add some screenshots.