Awwwwww, Dances with ducks, your duckies look exactly like mine! I saw that picture and went, "Oh it's Victor and MingMei's dopplegangers!)"
Here are my knuckle heads-
They are a very skittish breed. Mine are imprinted and bonded really close to us, esp since they sleep inside, and they are still scared of everything! They'll run away from their own shandows, anything long and stick like, anything big and scary your are carrying (a water jug, a piece of board, lol), their own eggs, baby chicks, and mine are esp not fond of anything big anf blue (esp the sky, lol).
So if you want outside ducks that'll be nice and come up to you, runners wouldn't be my number one reccommendation. I guess it's possible but you have to spend and unbelieveable amount of time with them when they are babies. (I mean like all day and all night, holding them every chance you get, making sure they are seperated from each other, and even letting them sleep where they can see you). Other ducks that are less skittish would still need lots of love as a baby, but the process to me seem less futile. Runners are not just called runners because they are fast, they are called runners because they run away!