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It cannot be made simple switching permissions threads. It already concerns to permissions a forum. Resolution to see a certain node automatically gives the chance to see and the remaining threads which are in this node.

It is necessary to ask developers about the virtual node in which it would be possible to add threads, saving their presence at those nodes where they initially were and remain.

Still, as a variant, it is possible to ask to make developers function of creation of a link for a thread. By the way, quite interesting idea.