Hi,
I've recently changed jobs to one in which I don't need matlab.
I'm still maintaining the bundle, though, so I'm more than happy to add any additions or other language definitions.
To add a new language, I'd start by cloning either Matlab's or Octave's and using that as a basis for your new one.
If the language is very different, though, you might need to start from scratch. Glancing at the website, it looks like modifying the octave language would probably work quite well.
If you need an intro to writing language grammars, I can't recommend the TM book (
http://www.pragprog.com/titles/textmate/textmate) highly enough.
This group doesn't have many members (or much traffic), so if you know of any TextMate wielding Sysquake using people, then get them to join: you're more than welcome to discussion it here.