To clarify, Wikimedia Italia doesn't financially sponsor this site nor
contribute content to it. AFAIK our volunteers provided some MediaWiki
training to the site's users. Wikimedia Italia is always happy when
MediaWiki usage spreads, but recommends Wikibooks and Wikiversity as
primary platforms for OER activities.
As for your question, there are a couple useful things you can do:
1) write a document where you explain what makes your platform more
suitable for your activities and what features Wikibooks/Wikiversity
lack in your opinion;
2) publish your code in Gerrit:
https://www.mediawiki.org/wiki/Git/New_repositories/Requests (you made a
Docker extensiona and the skin, right?
http://it.wikitolearn.org/Speciale:Versione);
3) report bugs and feature requests
http://phabricator.wikimedia.org/ ;
4) (as you use Debian) take ownership of the Debian package, which is
currently abandoned:
https://wiki.debian.org/MediaWiki ;
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=728347 .
Nemo