Welcome to BYC. First, the name of the bird is linked to the State of Rhode Island.
The Rhode Island Red is now known by two distinctly different varieties. Hatchery birds and true bred, heritage, bred to standard fowl. The hatchery birds are all over the map. They typically have Brown Leghorn blood in them to make them better layers, which means more profits for the hatchery. You can see the influence in the body shape as they aren't brick shaped as a true bred Red should. They don't often have the long back or the lower carried tail of a true red. Hatchery reds often have tails mounted quite high. A true RIR is deep mahogany red, like a dark bing cherry.
The reason this is also important is that production reds, as they called, also have a different personality than the heritage Reds, which can only be secured from a preservationist minded breeder.
Pecking of birds is not the result of breeding, however. It is often the result of crowded conditions, boredom and is particular acute in flocks lacking protein, especially animal protein, in their diet. Feathers are essentially protein and feather pecking results when the diet isn't what it should be. The birds are also subject to lice and mites and sometimes feather pecking is caused by this infestation.
Hope that helps.