I haven't found this suggestion anywhere else, so will put it here as a request, for discussion.
Would anyone else find an option to 'bulk add' studies to a series useful?

I've just imported ~2000 sermons and will in due course be adding them to series.. but it's a bit of a hastle to go to each study and individually add it to the series.

A suggestion of how the feature might work would be to select a series in the 'series' section of the backend, and click on 'add studies to series'. Then user would be presented with a list of studies with checkboxes... user would check all relevant studies then click an 'add to series' button.

I'm going to fix up data using phpMyAdmin which should do for now... but what do others think?