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This has been possible for almost 6 years. Set the default permissions in the Permissions Configuration page. These will be applied to all files and folders EXCEPT those you have explicitly set different permissions for. Please read the documentation to understand how this feature works.

I did understand you the first time. However, what you are asking is the same as what I said.

1. Go to Components, Admin Tools
2. Click Permissions Configuration
3. Set the default permissions (see https://www.dropbox.com/s/pebnr6jyzv70rkx/Screenshot%202016-02-24%2016.34.52.png?dl=0) and click on the blue "Save default permissions" button
4. OPTIONAL: Set custom permissions in the rest of the page. If you leave the permissions as three dashes (see https://www.dropbox.com/s/5eq328gbpk4rlwu/Screenshot%202016-02-24%2016.35.45.png?dl=0) then the default permissions you set above will be applied to this folder.
5. Click Back
6. Click on Fix Permissions to apply the permissions

If you have NOT set custom permissions (permissions are set to triple dash, i.e. the default) for a file/folder THEN the Default Permissions will be applied.

If you have set custom permissions for a file/folder THEN the custom permissions will be applied INSTEAD of the default.

Since by definition a single file/folder can only have one set of permissions applied onto it it grows to reason that asking me to apply both permission sets makes zero sense. You either apply the custom permissions or the default permissions. Indeed, if there are no custom permissions set then the default permissions are applied. This is already documented.

If you have further questions please do consult the documentation.