Hello,
I'm working on more than 10 apps for Yunohost, and adding a app as official is very difficult. I work on other apps for now, but I'm earing your request and it's ok. TitusPiJean needs to work on his extension to make flarum compatible with the Yunohost Login/LDAP Login.
And as I said, YOU CAN CONTRIBUTE (highly recommended) : https://github.com/YunoHost-Apps/flarum_ynh
I've not said that I won't work on flarum, I've said that this bug comes from an extension which is out of the package itself. I can't work on the extension because I've not write access on it and I've not enough knowledge in Javascript and not enough time to learn how it works.
For information, if you want to contribute to Yunohost package and Flarum (as you said) don't create a new package, commit on the package which is in the Yunohost-Apps organisation.
Another information, the packages are integrated in Yunohost, so, no need to do a new version.
Thanks for reading this,
frju365