Is it possible to hack theme Sterile to work with subalbums? If yes, than how?
And when the new release will support subalbums for all the themes?
Thanks!

There is a subalbums version of Sterile included with the SVN version of Zenphoto. You really should use that version anyway if you want subalbums. Go to http://www.zenphoto.org/trac/browser/trunk to download the SVN.

You can browse themes from the above link to see which ones support subalbums.

Thanks a lot!