For users that only have read access rights on project.task, the activity widget is greyed out (read-only/no create, write or unlink access).

How can we make the activity widget accessible for those users? Granting them write or create access rights to project.task in not an option to consider.

I saw on the codebase that mail.thread introduces the attribute  _mail_post_access = 'read' that allows these users to post messages on the chatter.

Is there something similar for mail.activity.mixin? If not, how can we achieve the wanted goal?

Thank you in advance