You can now manage the availability of the list custom settings type when creating custom settings. The list type provides a reusable set of static data that you can access across your org. To prevent creating custom settings when using application-level data definitions, disable this option in Setup.
|Available in: Group, Professional, Developer, Enterprise, Performance, Unlimited, and Database.com Editions|
With the option enabled, you can choose List as the setting type when defining a new custom setting.