[xwiki-users] Set plain output from within script

I have several scripts (Groovy and Velocity) that generate output that should not be rendered as a Wiki page. This is necessary, for example, when rendering JSON. As documented before (http://extensions.xwiki.org/xwiki/bin/view/Extension/Output+JSON) , it's possible to allow such content by including request parameters xpage=plain and outputSyntax=plain. However, this approach requires all pages that refer to the script to remember to include these parameters, which is rather error prone. Is there a way for a script to explicitly disable rendering instead?