Thanks Cheryl, I've added a comment to that thread now 

I completely agree as well, at the moment the feature certainly lacks in a lot of areas that cause problems for our users. For us in particular it's around not getting notifications for commit date changes, or being able to approve changes to the dates.

Currently the delegation feature has limited value to us as the real value would really come from being able to delegate project ownership as well as individual tasks, particularly so that things such as commit dates can be delegated as well.