I'm the author of WP-Syntax. I haven't had much time to respond to support requests, maintain it, or add features in the past year or so, and I apologize for that. Honestly, I don't use WordPress as much anymore, so I'm no longer scratching my own itch.
I want the community to continue to use WP-Syntax if they find it valuable, and I want to open it up to more community involvement. I'm looking for a new maintainer who is interested in WordPress and PHP. If you are interested, please email me.** Please include other WP plugins you've worked on and what you would like to change about WP-Syntax. A patch for WP-Syntax could get you far if there needs to be a selection process.
** Finding my email address is part of the selection process.