Cross Project Predecessors - Automatic % Completion Updates

It would be nice if a project is a predecessor task on a 2nd project, that the predecessor task % complete field automatically update as it's linked project percent completion progresses. for example:

Project 1 - is currently at 50% completion, a few tasks within this project are completed and the % completion changes to 60%

Project 2 - has a task (Project 1 as an enforced predecessor), as the activity in Project 1 causes it's % completion to update to 60%, it would be nice for the task in Project 2 to automatically update to 60% to coincide.