WordPress gallery for documents

I’m trying to find out how I can use the media manager “create gallery” functionality with a theme or plugin. An input field will store the shortcode or data. The problem is I can’t find out how I can make the gallery functionality to not only display images. This could be useful for making document lists.

Changing line 646 in the media-views javascript file from:
this.set( 'library', media.query({ type: 'image' }) );
to
this.set( 'library', media.query({ type: '' }) );
seems to open up for all types of attachments, but how can I override this with a filter or in a custom javascript?

In addition I was wondering if it is possible to get other types of posts too? This last bit is more out of curiosity, and not something I need now.