It would be great to see an option to add sections to the page builder.
This could really increase the flexibility of the visual data on the page by having option of when to display that data if particular fields are empty.
For example, you have a linked record that may not always get completed dependant on the task, but currently if you want to print that data you would have to set it up in the page builder anyway and print blank fields.
By creating a section, you could drop a group of fields in there and select which ones need to be complete before this section will show.
This would also work really well with larger invoices, rather than guess the number of lines you may need, the sections would push the lower order section down the page.
Hopefully this makes some sense because it would be awesome to use… in my opinion