Question : user definied DB role

can you add to the below listed roles, that comes built-in, for a database?

thanks

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DBRoles.bmp (191 KB)  (File Type Details) 

DBRoles

Answer : user definied DB role

yes, you can add more roles to that list:
CREATE ROLE
http://technet.microsoft.com/en-us/library/ms187936.aspx