[NTG-context] Float caption feature request

Hello, In LaTeX (don't remember whether this is generic or specific to one of the packages I used to use), the 'caption' command for floats came along this way: \caption[optional short version]{Caption} If one uses the 'optional short version' bit, the Table of Figures/Tables present the short version rather than the whole caption (which in my case is long paragraphs and makes the TOF/TOT unpractical). I would very much like to have that functionality in context. Thanks for any hints on how to achieve this. Poking around in the source did not lead this newbie to a starting point ... Joh