Quote:
Cons: be hard to use a droppings board if you ever want to. Takes up a lot more coop space (intrudes into the middle of the coop more, I mean). And if by "corner" you mean running diagonally between adjacent walls, remember the chickens won't be able to use the very ends of the roost too well b/c of how the wall will slant in.
Pros: I'm not sure there are any, unless you MUST do that to avoid running a roost right over the food/water in a situation where a droppings board is not possible; or unless you have an awkward-to-winter-ventilate coop and have to have the roosts all at one end. I mean, you certainly can put in your roosts any way you want but IMHO a single long one is usually better, or at least if you have parallel ones make as few as possible and have them parallel to the wall, not diagonal (if that was what you meant)
If your problem is that you have no wall space to attach one end of the roost b/c there is a door opening up right there, it's quite easy to make a vertical prop to hold up that end of the roost. Piece of 2x4 sticking up on end from the floor, with angle brackets for stability, or something like that.
JMHO, good luck, have fun,
Pat