No revers engineering. Just using the function and class methods that are there. But sorry, so "just one click" solution for things like this.
> Too bad. I would be nice if there was a way to bulk add info like this to Zenphoto.
Well, it is a matter what you out put where on the theme. No one can know where you want it. The data is already there since it should be imported as mentioned if you have the metadata fields enabled.
On the single image page most themes do display a table of metadata that are enabled. Don't remember if zpbase does this as well. But titles on the album (the thumb list) no theme currently does or has options for (a future theme might but, well,that is future…).