Navigating to a report in another folder

I'm setting up a reporting system that eventually will contain potentially hundreds of reports. I'm setting up the system using a folder system to combine similar reports together. Many of these reports contain drill-down (ie: Navigating to another report). In some cases I have Summary Reports that will need to navigate to reports in other folders. I've tried different ways of linking to these reports - but with little success. It seems that the Navigate to another report is strictly limited to the current folder - it won't accept a '\' character to signify drilling deeper into the heirarchy and when I try creating the links using URL's it seems that the Report Manager doesn't accept parameters like the report viewer.

I woiuld appreciate some suggestions regarding the best way to handle this type of scenario. I really don't want to have all the reports in a single folder.