The Bamboo Quick Add List Ribbon Button is a feature that can be Activated/Deactivated at the Site level; you can find it under Site settings > Manage Site Features > Bamboo Quick Add.
The Site Settings allow an administrator to set the number of items that can be created at one time using Quick Add, as well as view version information for the product. A maximum number of items per Quick Add attempt can be set, or an “unlimited” number of items can be allowed.
NOTE: There may be performance impacts if an extremely large number of Quick Add item creations are attempted at one time.
The Site Settings for Quick Add can be found under Site Settings > Bamboo Settings > Bamboo Quick Add Settings.