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We are using TSM with tape backups and RMAN catalog database. Retention policy of the backup is 31 days and record keep time in control file is also same, 31 days. So I unregister the database from the catalog (so it deleted all the entries from the catalog and the tape backups untocuhed!) and re-registered again. I was able to re-register the database to the catalog with all the bacups since the record keep time (parameter value) is 31 days. Ran TDPOSYNC to sync the TSM with RMAN.
FYI - just coz your controlfile_record_keeptime is set to 31, it doesn't mean you'll automatically have 31 days worth of stuff in your controfile. It is also proportional to the size of your database and # of datafiles.