Is it possible to send an update request to the user assigned to the row?
For example, I have five tasks listed on my sheet, each assigned to a different user. I would like to select all five rows and hit 'Send Update Request' and use the 'Assigned to' column to determine who it should go to.
Having to re-type the assignee's name/email seems to defeat the purpose of the contact list column type's functionality.
Any ideas or planned feature updates? 
Cheers!
Scott