Would be a cool feature, test fills all your territories at once, instead of going to each territory and testing only that one.

If you want it to be really cool, test fill all with a random color from the player color palette in each different territory so you can actually see them all filled up the way it might look in a game.

Alternately, test fill all with the fill color locked to Navy so Yertle can prepare himself for the inevitable result of any game he's in with me.