Adding Capture Date extra field to all albums?

I would like to add the "Capture Date" field to all my old albums. (75 albums, not counting the many subalbums.) I would also like to have "Capture Date" field be enabled by default for new albums, at the moment I have to enable it each time.

The latter is probably more important / useful to gallery, if it is not already possible. The former I hope to be able to fix myself once G2 comes out, if it isn't possible easily right now. If it were possible to move all the albums into one album (as subalbums), I'd be able to recursively apply the change, then move them all out of that album again afterwards...