> (info "(gnus)Article Keymap")
> ,----
> | `R'
> |      Send a reply to the current article and yank the current article
> |      (`gnus-article-reply-with-original').  If given a prefix, make a
> |      wide reply.  If the region is active, only yank the text in the
> |      region.
> `----

Maybe I didn't digg enough into this, but what is the difference between
`C-u R' and `S W' ?

-- 
Bastien