We need to prepare a report with a list of all of the tasks a user has worked on. Right now we're having to construct this manually by looking through the tasks a user was assigned to that are also in a closed status, but this doesn't accurately represent tasks a user worked on but then reassigned to someone else (to hand it off for them to work on some component of it).

It would be ideal in Maniphest to be able to query for tasks that have time tracked for a given user (similar to the way you can query for tasks assigned to a user).