Commons has edit tools in-place with the content in the wiki toolbar, while in all ta wiki has edit tools after the edit summary. It would be nice to have the same features in tamil wikis also.
User scripts, gadgets and templates are local features and managed independently on each wiki. Phabricator/Maniphest is used for MediaWiki, MediaWiki extensions, or server configuration. In general this is a matter to discuss and fix on the local wiki and not handled in Phabricator/Maniphest until https://phabricator.wikimedia.org/T121470 gets solved.