Reschedule or delete 'multiple' tasks at once in the task list

Currently it is a very laborious process to do things in bulk in the task list. I feel there are 2 improvements that need to be made:

1. Allow selection of multiple tasks whether there are overdue , due, or planned and reschedule them in bulk to another date.

2. Enable admins to 'select all' in tasks list to perform an action such as delete - currently you have to manually tick every individual item in this list which is a pain.

This will enable admins to admin effectively and efficiently, save time and save frustration. Maybe it could be given to managers too?