I've got a Skyline who is EVIL when she's broody and worse once they hatch. Excellent mum though and is sitting on her second clutch of 2014 right now. But she'll jump right out of the coop at you if you lift the lid at the wrong moment. At the end of the day I would rather that sort of behavior as I can imagine what she would do to a rat or similar trying to grab a chick.
My next plan is to separate roosting and laying. So, one house will be a simple roosting station where they go at night or in poor weather. The other will be a nesting station which I plan on making out of one of those garden trolley things. That will mean I can move it around the pen to clean grass as I find the area around the house turns to mud in winter and this leads to mucky eggs. It will also discourage hens from sleeping in the nest boxes as they will want to be in the main house and I also think that if we do get a broody who we don't want to have eggs, she can be taken out of the nest box at bedtime and put on the roosts. That will mean a walk through the dark to get back to her nest which I think should break most of them.