There is a specific for bulk deletion, yes, but not for bulk editing:
Should users bulk complete tasks, that’s something you can check via reports or by filtering the task index page – in both cases, you would filter for task status completed:
These requests submitted to the HubSpot Ideas section of the community are reviewed by the HubSpot product team, based on their popularity and the assumed demand. I’d recommend commenting and upvoting.
You can also help other HubSpot users find this request more easily (and drive traction) by accepting my reply as a solution. I’d appreciate it, too.