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In the same wya custom fields can be added to user profiles, it would be nice if admin could have an option to add custom fields to discussions in specific categories of the forum. eg. A forum has a website feedback area, it would be nice if whe posting replies, the users had a seperate field in which they are asked to provide their browser/OS information. With this kind of extension, you would add the facility for thread startes to add tags to thier discussions, and for forum administrators to have a greater level of control over how discussions are formed.