Some wikis use the mentor's list talk page as a coordination page. We need to take these pages in consideration if we change the list format.
As the current plan is to move to a list on the Mediawiki namespace, we can imagine to keep have the talk page moved to Mediawiki talk:.
It Mentors are less likely to watch a Mediawiki page that is not at reach. Can we imagine a way to show new messages posted at Mediawiki talk: on the Mentor Dashboard?
This Mediawiki talk page could be overridden, if another coordination page exists (as a wikiproject, for instance).