Can I customize the article submission settings per user?
Ninja Content doesn't allow you to assign permissions and settings to individual users, so this is not possible to do "out of the box". However, there is a workaround that might work for you.
Ninja Content only allows you to assign settings/permissions to User Groups, so the workaround is to create a new group for each user and give that the group the custom settings/permissions you want the user to have.
To do that, you need to use an extension that allows you to create groups. We've gotten feedback suggesting that the following extensions work fine with Ninja Content, but other User Group extensions may also do the job.