It would be helpful to be able to add the same comment to multiple ideas at once. I use this to record when I have sent a group of ideas to a group or have done the same update to multiple ideas.
Thank you for your idea. It is currently possible to add a comment to ideas in bulk using the import from CSV. This article describes the process in more detail. One thing to note is that these will be added as private comments on the ideas. If you need this information to be shown in the ideas portal, we would suggest using a custom field which could be edited using bulk edit and displayed in the portal.