I just have a cheap little fence of branches around my area for now, and the pieces of the fence are always rotting away (even on pavement)... Rarely to the point of disappearing, but there are a bunch of damaged spots. I've also seen this in palisades along my travels. Anyhow, it's pretty annoying having to carry a bunch of branches and patch these spots up one by one. How about an option to fix the entire fence in one go?
You could right-click a cornerpost, choose "Fix fence", then it would magically repair the fence in all directions until the next cornerpost. It would still fix them one by one, you'd still have the hourglass, and it would only repair as long as you've got the supplies handy. It would just be less tedious. This could also work for palisades and I suppose brickwalls (I don't think I've even seen those yet, so I dunno how troublesome their decay is).
edit: This idea is better: viewtopic.php?f=5&t=6096