[NTG-context] footnotes and variable rules

Hi to all, In some countries it is traditional that footnote rules have the following behaviour: When a footnote doesn't fit entirely in one page, and has to be continued in the next one, the footnote rule in the second page has to be longer, to show that the footnote doesn't start there, but in the preceeding page. So, if you normally use a e.g. 20%\textwidth rule, the rule in the following page has to be longer, typically 100%\textwidth; if you don't use footnote rule, the following page has to have a e.g. 20%\textwidth rule. In LaTeX this can be done with the footmisc package. Can this be done with ConTeXt, e.g. redefining \normalnoterule? Thanks in advance, Ricard