Can you test the following patch.30. Juli 2015 16:26
I wonder whether there is a bug somewhere in notes, because you may have
r2l notations, but the notes paragraph is built l2r:
\setuppapersize[A6]
\starttext \showframe
\definenote[afootnote][rule={on,right}, paragraph=yes]
\definenotation[afootnote][align=r2l]
\startalignment[r2l]
Testing.\afootnote{This is footnote one.}
Testing testing.\afootnote{This is footnote two.}
Testing testing testing.\afootnote{This is footnote three.}
\stopalignment
\stoptext