Register a server that has only SSRS (Reporting Server - BI)

I want to register a server that has only SSRS (Reporting Server - BI) installed, no SQL Server.  The registration screen, and TEST, attempt to use the SQL interface (and fails of course), then doesn't show attempts at Windows WMI connections.

I want to collect data about the Server Itself, and about SSRS as well.

Hints on how to register would be appreciated.