Manipulating inventory in child prims. For example, managing a hierarchical inventory storage (boxes of textures comes in mind, 50 boxes of 100 textures = 5000, not an easy task inside a single prim).
I don't know why they have been added specifically, but I'm sure I can put them at work. The *s family (GetInventoryNames/Keys) is a significant shift in the way we handle objects inventory. They return a list, avoiding the need to iterate.
As for the two functions in the scripts, that's a fresh proposals (MANTIS 9116). I use them to adjust the sittarget of a slightly misadjusted seat without restarting the whole process from nil.
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