Not sure… we didn’t want to make the built-in Gallery too complex. We can see either us or a third-party creating a super pro gallery that does EVERYTHING in the future.
We’re open to adding in features to the basic gallery, we just didn’t want to overload it with options we felt most people wouldn’t want…
Yes, I would like to be able to write captions and at the very least be able to number the images. I can see how down the road someone will create a gallery with more customized features, but the base gallery should still be useable. At the moment I use the gallery in the Lode Theme for Rapidweaver.