Assign task to multiple users

I am in a business partnership. We set up our transaction plan, but only one of us can be assigned to task. We really need Lion Desk to allow tasks to be assigned to multiple users so that we can each view the tasks in the app. Right now we waste a lot of time on the phone checking to see who has done what. For both of us to be able to see in the app all the tasks associated with a plan and who has done what would be great!