The topic author can activate the slow mode only for a topic now: Discourse 2.6.0.beta5 Release Notes
Topic slow mode
We added a new slow mode for topics that are heating up. Staff can enable slow mode from the topic admin wrench. When enabled, users will have to wait for a staff configured period of time before being able to post again.
The question is:
Is it possible to do the same but for a category? May be it’s possible to add such setting to the category settings to automatically activate it for all new topics in the category?
I found it useful to make discussions very thoughtful, but it’s not convenient to do it manually with every topic in the category, because sometimes authors forget to activate it.