I've been playing with it, and I had some of our support guys try, and it doesn't appear that a multi-column table such as you describe is possible.
Unfortunately it's only designed to show counts (basically the same thing that would drive the pie/line chart), so you can see something like:
Destination Account | Time
accountname | 1
but you can't add the third column.
This is a good idea though. When you choose a table, it'd be nice to have an "also include these fields" kind of option.
In this case I'd probably go with building your chart based on Event Info, since it also contains the username.