And for anyone who uses calibre, my Kobo Utilities plugin has this as a function.
As a suggestion here create the trigger as:
Code:
UPDATE Activity SET Enabled='false' WHERE Type IN ('Sync', 'Recommendations');
That will dismiss the sync and recommendations tiles.
The last time I checked, the full list of tiles is : Award, Bookstore, CategoryFTE, Extras, GlobalStats, Library, QuickTour, RecentPocketArticle, Recommendations, RelatedItems, WhatsNew, Shelf, Sync, Top50.
As to how well this works, it depends on the tile. Some it can completely block. Others will appear and then disappear on the next home screen update and some it seems will only disappear when you restart the device. And this has changed with the firmware versions.