Any way to automatically tag all nodes that are imported?

Hey there, I was this project where the users would like to import hundreds (maybe thousands) of pictures from flickr. Unfortunately, those pics are not tagged at all. I know we can tag them at upload time, but I was wondering if it was possible to assign a tab to the whole importing process.

For example when adding an album, at the same time we insert the photoset url, we could select a default tag from a specified vocabulary.. That tag would automatically be applied to all pics to be imported.

Let me know if it would be possible, or what I need to hack to to this??

thanks,
Alexis