Right now it seems like the fold indicator: […]
Is hard coded.
It would be really great to have control of the fold indicator from the API.
My orgextended plugin I am currently working on makes extensive use of folds, it would be great if there was a way that I could allow people using my plugin to replace the fold indicator for headings in .org files with a unicode character of their choice.
In addition, in some cases, hiding the fold indicator could help clean up the view. (links are an example, I am currently folding the link address automatically in an org buffer when your cursor leaves a link, it would be nice in that case to simply avoid the fold indicator entirely.