It would be nice if there was the ability to add multiple owners at one time to a task. How it is currently setup, when you click to add a user as an owner to a task you must select a user and then click on the owner field again to select a different user. When you need to add multiple users to a task this can become very cumbersome.

One potential solution would be when the popup menu is displayed to add users it would be nice if you could check/uncheck the users you wish to add and then click an approval button. This would then add all selected users and remove any unselected users at once to the task.