Specifying ReportServer database names during installation of Database Engine (named instance) and SSRS at command prompt

Hi, 

\setup.exe
 /Action=Install
 /QS
/SQMREPORTING=0
/IACCEPTSQLSERVERLICENSETERMS
 /ERRORREPORTING=0
 /Features=ADV_SSMS,BC,BOL,Conn,FullText,RS,SQL
 ....
 /INSTANCEID="S