OAuth (https://www.mediawiki.org/wiki/Extension:OAuth) presents a lot of possibilities for Flow:
- Alternate interfaces
all without having to give your password to any third parties.
It looks like posting to a board might (not tested) just work if you have the 'edit' right (which can already be passed via OAuth). But to have full support for Flow's features (hiding, deleting, etc.), I think we have to integrate the other rights into wgMWOAuthGrantPermissions.