Hi Hans,
\setuppagenumbering[alternative=doublesided]
is the command I know to work.
You can add either blank or
header and footer to page break option, such
as in:
\setuppagenumbering[alternative=doublesided]
\setuphead[chapter][page={yes, header, footer, right}]
\setupheadertexts[Header]
\setupfootertexts[Footer]
\starttext
\dorecurse{3}{\chapter{Chapter}\noheaderandfooterlines}
\stoptext
For
some strange reason (at least, unknown to me), header and footer
must
be placed before right (if specified at all).