After paying the xteam for this mod the option to globally or individually change a subscription is now available in xcart 3.3.1 ... well at least it is included in the tables. The xcart_tables.sql has been altered the same way my custom one was via the table xcart customer subscription table. However it may not be completely active, due to a missing php file.
My cart can now alow for individual customer subscription changes and global changes. If someone needs the ability to Change subscription fee globally etc. for existing customers let me know. :P