On Sun, 02 Aug 2015 11:25:01 -0600, Wolfgang Schuster <schuster.wolfgang@gmail.com> wrote:

Alan BRASLAU <mailto:alan.braslau@cea.fr>
2. August 2015 09:11
On Sat, 1 Aug 2015 17:35:38 -0600

Hello Idris,

I would think that your only hope in this case would be through the use
of \startparagraph \stopparagraph, for otherwise TeX does not know
where a paragraph is to end (only where one begins, through an explicit
\par or through an implicit blank line).

My guess, untested, would be \setupparagraph[after=\thinrule]

The paragraph environment has no before/after keys

Then the wiki is mistaken:

http://wiki.contextgarden.net/Command/setupparagraphs