You now have the option of choosing each additional info if it can be viewed or deleted. To add additional info rights to your user rights option go to the Options Menu in the Administration Screen. In the Admin sub menu click on "Add Additional Info to User Rights". This will add all your Additional Info types you setup to the user rights option. If at a later date you add more Additional Info types you would need to click this menu again.
You will now have two option for each Additional Info type. One is for the right to delete or change an existing value. The other is to allow viewing of the additional info.
PLEASE NOTE: Additional Info that have been setup to be shown in the Mail Merge tab will still be shown for everyone.