[whpalmer4]

One minor subtlety that applies to the "sort key column" idea: the sorting won't move items out of their group in the outline. So if I changed the sort keys for items 1.0, 1.1, 1.2 to 31.0, 31.1, 31.2, they would still end up in the exact same place because they won't get moved out of their group. You can't use a column to yank the rows into a completely different ordering than the outline (a sorting by worldwide number of cases of each condition, for example).