Not that I know of. There is couple workarounds I can think of.
1) Use local VS reports. This removes a SSRS dependancy (now and in the future). You can create a simple app with listbox to show reports and run them as local reports.
2) Setup a sql2008 server just for reports and "link" server to your 2005 data. Reporting server then is just a read-only report server. This may also be a good idea to start working with 2008 and slowing moving stuff over and testing.