Just front to back, why would you bother dismounting them and swapping sides?
If your alignment is setup right you should be wearing the tires unevenly side to side.
The only reason I like to swap sides with tires is because you can soften the edges of the "drive" or the "coast" side of the lugs depending on your driving style. But since they are directional they would face the same way anyhow. That is just part of the gay-ness of directional tires. lol