<p>Currently it's a big PITA to create timesheet report for say a week or month in FogBugz... maybe someone knows about a plugin to that for you?</p>

If you have FogBugz hosted on your own server, you can query the database manually and get timesheet results that way. If its hosted by FogBugz, then you can download the database, do the same query, or, use the API to get all the time entries. Some programs already exists for that, one of them is TimeSprite, but its not free.