On 2013–10–01 Philipp Gesang wrote:

> When using the characterkerning method you can exempt ligatures
> and character pairs from being letterspaced by defining the
> functions typesetters.kerns.keepligature (<liganode>) and
> typesetters.kerns.keeptogether (<prevglyph>, <glyph>),
> respectively. If the function returns a truish value for the
> given input, ligatures won’t be decomposed and no extra kerning
> will be applied.

I didn't know ConTeXt supports that. And it's even highly
customizable. Thank you very much.

Marco