saving books to disk template

Hi,

I’m wondering if in preferences/saving books to disk the default template can be different for different libraries ?


Also if I set the template to:
{series}-{series_index}-{title}-{author} for instance
and the series, series_index and author are empty for some entries, then my file name will look like:

- - title -

Is there a way to avoid hyphens without values before/after (conditional template)?