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My main duck hen is already setting a nest in a dead tree. The boys get pretty bad come spring. If they show any aggression or interest in chickens, they go. I have had chicken hens and roosters killed by ducks, trying to mate them. Its best to limit drakes in a small farm setting. They are dominant and aggressive towards other drakes. Or confine them, so they won't have access to the whole mixed flock.
Drakes have very long, sharp claws. Fight hard, flog, so be prepared if you plan to keep a large flock of them. I have had my arms and legs scratched up pretty bad stopping fights.