You can still do it to some extent, by selecting all of your territories, CTRL+D, CTRL+SHIFT+=, END, CTRL+SHIFT+0 a few times, select a colour, and you've got one layer! If you now (while it's still selected) do CTRL+D, CTRL+SHIFT+=, END, CTRL+SHIFT+0 a few times, and select a slightly different colour, you will begin to get something like this (
http://warlight.net/SinglePlayer?PreviewMap=14680).
But I'm not sure if that's what you meant.