1) My apologies, I misspoke, it minimum and maximum selections does not work on the values being passed, rather the minimum or maximum number of boxes that are checked.
with the minimum and maximum values set to 2 and 4, this will mean the user must check at least 2 boxes, but not more than 4 for the form to submit.
3) a. Required = A radio button must be selected
b. Empty Value = A radio button value that you do not want to pass validation
c. Required value = A value that must be selected to pass validation
4) The Country list type is associated with the Lists Group. the pre-populated list can only be added as a grouup.
You will need to manually populate the list values if you add the list when editing a group.