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I think he's talking about when you are viewing a thread, the Thread Tools menu allows you to quickly delete it, but it's a bit kludgey to undelete it since there is no Undelete option from the Thread Tools menu. Instead you have to select it for inline moderation, go up to the forum view to take action on it, etc.
I ran into the same issue and added an "Undelete" option from Thread Tools a long time ago.