Multiple paths/lane pushing would not be my idea of good Rookplay, but it may work=). However, a good rook will dump some towers on the adjacent lane at the tower. This is massively anoying and can help your teammate push the enemy from the flag.

Also, remeber teleports, a common misconception is that Rook is slow but very tough,to the contrary while Rook is 10 percent slower than other DG's this isnt that much of a problem if it didnt make him so much more suspecible to ganks. A rook may have 7k hp but it wont help when youre focued fired by 3 players and you cant run away. His towers will protect him from this, but you'll still have to be carefull against healers or 3 players at the same time, fro these situation: Telescrolls.

I tend to play the one lane rook, and make it one of the outlying lanes, far from the center. I don't tend to farm that much though, a couple of towers back in the lane and I go forwards to start eating towers. There are advantages to a mobile rook (I use amulet all the time, nothing funnier than just suddenly appearing right in front of the enemy, putting up a tower, and having them turn away because they don't have enough power to push through you, the regular tower, and your little tower) so you can really play him either way.