Redmine

I like to modify Redmine when editing Issue to add << author >>, the issue's author, to the Assignee drop down list; similar to << me >>. I need this because when case was completed, we will send back to the author for testing. Currently, I need to scroll to the top to find who the author is. Very cumbersome.

Can anyone show me how? I don't know Ruby but I think I can manage. I try to look for how the << me >> was added but could not find the source. Code I found where << me >> exist were in test/functional units.