Mike,
It's a bit labor intensive, but all of the SQL Server jobs just call a SMSQL command line. For example:
C:\Program Files\NetApp\SnapManager for SQL Server\SmsqlJobLauncher.exe new-backup –svr 'SQLSERVER' -d 'SQLSERVER\SQLINSTANCE', '0' -RetainBackupDays 7 -lb -bksif -RetainSnapofSnapInfo 2 -trlog -noutm –mgmt daily
(depending on the options you selected in the Wizard, your's may look different). If I wanted to extended my retention period beyond 7 days, I could edit the -RetainBackupDays to be 14. It's entirely possible to edit the command lines outside of the wizardn (after it's run) without effecting the SMSQL backups or their configurations (assuming you edit it properly).
At that point, it's a matter of you changing the job definitions on all of your servers -- which may not be trivial in your organization.
All of the command line options are defined in Appendix B of the SMSQL Installation and Administration guide:
https://now.netapp.com/NOW/knowledge/docs/SnapManager/relsmsql51/html/software/install/cli.htm
Hope this helps!
Thanks!
Jason