idle events in 10gR2

I just noticed this morning that idle events are very easily identifiable by a new column called wait_class in 10gR2

To ignore idle event, I just wrote

select WAIT_CLASS, event, TOTAL_WAITS, TOTAL_TIMEOUTS from
(select * from V$SYSTEM_EVENT where WAIT_CLASS#!=6 order by TIME_WAITED_MICRO desc)
where rownum<6;
WAIT_CLASS    EVENT                                    TOTAL_WAITS TOTAL_TIMEOUTS
------------- ---------------------------------------- ----------- --------------
System I/O    log file parallel write                        79713              0
Configuration log file switch (checkpoint incomplete)          210            100
Configuration log file switch completion                       165             52
System I/O    db file parallel write                           645              0
System I/O    control file parallel write                     2276              0