If the view all is the same as show all where it list all threads at once, aint happenin. Too much server load. Theres my thread/replies to see what you have replied to and new posts and todays posts to cover the rest.
I think the view all button is when your in a thread and you use it to show all the posts in that one thread, vs having to go threw it page by page. But I may be wrong to, or could be talking about the same thing.