Yes, this is possible through limiting privilege of the various categories, as well as potentially a custom bit of javascript to redirect users to the login page.
The missing nodebb
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If you want to see some improvements, very first step will be creation of the tickets here https://github.com/NodeBB/NodeBB/issues so they will be on radar of devs.
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@lombisi check out https://github.com/exo-do
We have done a plugin to ignore users and other to ban users for a specified time. -
I think the advanced bans system should be core.
There, I said it.