Keeping them somewhat friendly can be done, but it takes a lot of work, everyday. I have three pairs of mandarins and while checking nest boxes, feeding or cleaning the pond i can walk within a few feet of them with out them flying off, but as far as them feeding out of your hand like other tame ducks, its almost unthinkable.
Wood ducks are about the same only more skitish, last year i hatched 5 woodies in the incubator, raised them up like little babies, they would follow me around, eat crickets out of my hand and they would even crawl/jump up on me when i was sitting on the lawn, i turned them out in the aviary when they got old enough and for about the first week or two i could still hand feed them crickets, but one day the wild kicked into them i have never been able to hand feed them, let alone even get really close to them. They are wildfowl, so treat them as such. If you want friendly ducks get some pekins, cayugas or runner ducks or ducks of that sort, they wont leave you alone!!LOL............Jason