Since you are already looking at the tickets associated with a project, have the ability to add a bulk update: "Assign Tech", "Set Category", "Update Priority", "Bulk Update/Reply". I don't know that you could "Add to Project" since they are already in a project, "Merge", or "Resolve" because there might be outstanding tasks needing to be marked done.
I know I can go to Tickets and search by project number, select, Bulk Action => Bulk Update but lazy…