Instead of contracting all the forums to just the category titles, it would be cool if you could also contract to just the category + forum titles (so without the forum descriptions, and maybe the moderators)
I think the forum descriptions are only needed for new visitors. Once you are a regular visitor to a board, you don't really read the forum descriptions anymore, thus they take up a lot of space, which forces the (lazy) user to scroll more

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What do you think? It would be a cool addition to this hack IMHO.