[NTG-context] ConTeXt tool for enabling comments in PDF ?

Hi, in the MacOSX-TeX-list (mainly on LaTeX) I just read a discussion on "Comments in PDF" (by AcrobatReader7). Do we have a ConTeXt tool which can enable users of e.g. AdobeReader 7 to add comments to PDF files ? Or is it true that this "comments enabled flag" can only be set for PDFs generated by Acrobat -- and only by the original author? Steffen Henning Hraban Ramm wrote:

There's a lot of new or enhanced features for us prepress people, e.g. for Reader Extensions you don't need this expensive server product any more, that means, if you own Acrobat 7 Professional you can enable the correction tools in Reader for your document.