Hi!
The ProofreadPage lack of documentation is a real problem since the creation of the extension. For example, I discovered in 2012 that some en.wikisource administrators didn't know the very useful header=1 parameter of the <pages> tag.
Currently the installation and configuration documentation is stored on the extension page on MediaWiki.org [1]. But, about the user documentation (parameters of <pages> tag…) there is no authoritative source, only some partial pages on oldWikisource and on help pages of language based wikis.
I really believe that this big issue should be fix. I think the best way to do it is to create a central documentation page for end users in the Help namespace of MediaWiki.org, that would document all the features of the ProofreadPage extension and be updated when things change in the extensions. It would be written in English and then translated in the same place using the Translate extension, so all Wikisources should be able to replace their own partial documentation with this centralized version.
But, because of my lack of free time, I don’t feel able to archive this goal alone. Is there someone ready to start the work by collecting data disseminated on oldWikisource and one some language based Wikisource and start this page [3]? I’m ready to help for the not documented yet parts. It doesn’t requires technical skills, only a knowledge on how to use ProofreadPage. So I think that any experienced Wikisource contributor is able to do it.
Many thanks to the person that will do it, who will have the eternal gratitude of the Wikisource community.
Thomas
[1] https://www.mediawiki.org/wiki/Extension:Proofread_Page [2] https://wikisource.org/wiki/Wikisource:ProofreadPage [3] https://www.mediawiki.org/wiki/Help:Extension:ProofreadPage