Man in the middle... On your DS!!!

I was watching some Hak.5 Eps and found the ARP cache poisoning one. I thought to myself, with a packet editor and Cain couldn't you cheat on online games? I looked into it and found that you can route all data packets from the DS through your computer. I haven't had time to find a packet editing program quite yet but I'm sure with the right tools you can own EVERYONE in Metroid lol. Here's what I did: Open up Cain (to get it just google "Cain Abel", go to the first one and dl it) and go to the Sniffer tab. Click the + button but don't start it yet. Turn your DS on and get to the "Test Connection Screen". While your DS is testing the connection press the Ok button in Cain and it should find the DS on the network. Next go to the APR tab on the bottom and select the DS on one side and your WIRELESS router on the other NOT your gateway. Start poisoning and test the connection again and you get all the packets being routed!!! Hope this can help someone, I'd love to hear from you guys.

Sorry about the double post but I just had another idea. Could this possible be used to trick the DS into thinking it has software that it can download? Like if you went to the "DS Download and Play" thing and edited some packets while it was searching, could it do a multiboot perhaps?