Hmm... adding this to this thread because it kind of fits in with the idea of HotCat.js.

What about the ability to mass-add images to a category? I'm thinking of cases where people have created a gallery with images but none are categorised; this happens a lot and it's a pain to open every image and edit to add the category. Something like Magnus's category move javascript, where you can select images in a category and move them to another, but activated for galleries.

I'm thinking...
This would be very helpful.. perhaps it could even be written into an existing script, or based off one?

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Ayelie
  ~Editor at Large