I would also like to override the 30 item limit! I am trying to use the summary block to show sold properties on a real estate website (don't want to auto populate the data from the MLS because I want to choose a different main image of each property).
I have different summary blocks with galleries on different pages (sold pages 2 and up are unlinked) and have added links below to act as page directions, but it would be SO much easier to just add the listings to a single gallery and have a load more button at the bottom. The method I am using currently ads unnecessary pages to the site which I don't like.
Link below to show what I mean: