RMAN- retention policy setting

Hi,

here are the setting in my prod database,

1 and 2 are set on my rman backup script as we have policy of deleting backup after 35 days.

do I need this 2 points to set or  #2 is enough ?

whatever it is , what is the effect of #3 on backup and recoverability ? 

I'm using oracle 11.2.0.3 on Linux VMware............

1.  CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 35 DAYS;

2.  delete noprompt  backupset completed before 'sysdate-35';

3.  SQL> show parameter control

NAME                                 TYPE        VALUE

------------------------------------ ----------- ------------------------------

control_file_record_keep_time        integer     7

Thanks in advance.

TCY