export kern pairs and ligatures to .otf
You have nice tools for editing kern pairs and ligatures, but it pains me that I can't use them in .otf files. That's my primary target for my work.
Yes, this is obviously a huge gap. Right now, we rely on the OpenType.js project to read and write font files. OpenType.js does not support saving ligatures and kerning, so we can't implement it. They are working on it, but no idea when it will be available.
The workaround is to Export to SVG Font, then use an online font converter to convert to whatever other format you need (like OTF). This is what I do - it is an extra step, but it does work.