Great request and a feature that’s on our roadmap. Requests like these are very helpful and help us prioritize, so keep them coming. 
A related feature we also plan on adding, may be of interest: Tags based on .rpt Inspector desktop playlists concept.
No limit on adding reports. But that many will surely take some time to add, especially if they have saved data (though we don’t send your data, it just takes the broker longer to open the report for processing).
If all those reports are for using the Save without Data tool, as we were designing that tool we were considering adding an option to make changes to reports directly.
Meaning within the Save without Data tool, there would be a toggle, if selected, you would see a reports lists, much like the one you see when you add reports. This way you wouldn’t need to spend the time first adding the reports (which analyzes the objects and properties).
Thoughts?