documents set access to an user group

Hi !

For documents I have to give access to an user group , I cannot select them one by one, without this feature I cannot use your extension

A guest or visitor can never download or read anything , all documents are private
how can I do it as default settings , new documents to registered only ?

thanks for helping

can you tell me please how I can set rights to not allowed as default value for each new category or new created document ?