It would be convenient to be able to build a link to Special:UserRights with the reason field prefilled.
According to Amalthea, this isn't possible at the moment...
Because it's coded that way: SpecialUserrights.php, line 456 in r77562:
Xml::input( 'user-reason', 60, false, array( 'id' => 'wpReason', 'maxlength' => 255 ) ) .
http://svn.wikimedia.org/doc/SpecialUserrights_8php_source.html#l00440
Version: unspecified
Severity: enhancement
URL: http://en.wikipedia.org/w/index.php?title=User_talk:Amalthea&oldid=409001396#wpReason