I'm not sure you could make one now, but Allan has said that TextMate 2's folding system will be more scope-based than the current system.
Ah nice ... I missed that post, thanks.
Incidentally, it's likely not impossible to add docstring folding to the folding patterns of whatever language you're using, even in the current TextMate.
Yeah .. I was still kind of referring to Python. There are start/stop fold markers based on """, but they get hosed when you put a whitespace line between paragraphs in the docstring (since it matches the tail folding marker based on the indentation level I reckon).
Previously I put just one space on blank lines so as to not have it fold there, but it gets kind of tedious to keep up and adhere to when more than just myself are fiddling on the same codebase.
-steve