Copy the Wii and Cache folder between all of you, that is how to sync the NAND.
In the latest dev build, in the top left of the netplay box is the option to switch from Direct to Transversal, which is an alternate way to connect over netplay, but leaves the actual gaming as P2P. You can read the February Progress Report for more info.
In the latest dev build, in the top left of the netplay box is the option to switch from Direct to Transversal, which is an alternate way to connect over netplay, but leaves the actual gaming as P2P. You can read the February Progress Report for more info.