One of the most useful qualities of a dashboard is the ability to filter records from large data sets to find only the records that are relevant to a user. It would be great if users could download only the records they've selected. Currently, they can only download the whole data table. After doing this, they have to do the same filtering for a second time on their own (without the benefit of the dashboard GUI).
If users could download a subset of selected records (especially if they could download these as a .csv file), anyone could use a dashboard that is posted in JMP Public to explore/filter large datasets. In my mind, this would be a huge leap forward for JMP Public. Without features like this, JMP Public is more of a "gallery of ideas" than a practical archive of applications.