Add disappointed user name to Shared File Not Found log

The diagnostics log for Shared File Not Found says what unavailable files people tried to queue from you, but it doesn't say who was trying to queue them. I would like to know who made each request, so I can contact them and try to help them get a file which has probably just moved to a different folder. For example, I'd like to see each line in this log begin with "For <username>, path <path>" instead of just "For path <path>".