I have found myself creating large mockups. However with Balsamiq 3, as I add more mockups balsamiq slows down, eventually to an unusable level. Consequently I end up splitting my mockups into separate project files. Unfortunately I cannot link to a mockup in another project file so I loose the ability to demonstrate the full mockup dynamically or create a single dynamic PDF.
Ideally, If I open 2 or more projects, when I link and scroll down to find the link I’d like to be able to see the mockups in all the open projects - grouped by project.