As a user I would like to be able to edit Ideas with the Bulk action to add the same watcher to all of them.
Just Launched! — Make Bulk Changes to Your Product Roadmap Data
Bulk editing is now available in nearly all list reports. This allows you to quickly update most of your records including goals, initiatives, and ideas. You can also add or remove watchers.
Learn how to use a list report to bulk edit your product data.