Around a year back I made a little hack so that administrators could see what
users do on their dashboard via a 'user' parameter. This has come in handy for
diagnosing issues on several occasions so checking if you would like to have it
upstream.

This is available in my 'dashboard_impersonation' branch...
https://github.com/atagar/ReviewBoard/tree/dashboard_impersonation

We've been running this change with ReviewBoard 1.5, and it hasn't been
exercised with 1.6. To run it simply provide a user argument such as...
http://reviews.reviewboard.org/dashboard/?user=atagar