Just like in the Knowledge base, you should be able to select access/visibility via Segments in forums, you can only select the all, logged in user, agents or select companies.
If you have a huge customer base, it becomes completely unmanageable to choose companies per company through select companies and keep track, must be able to segment this.
This should be seen as correction rather than a idea since you released the segment feature way back which can be used in knowledge base and automation rules but seems to have been forgotten in forums.
