I had an Omnia and I had iGO 8 on it. I don't remember all the details but it worked fine. So at least you know it can be done. You need the iGO installtion which has a directory called "2577" IIRC, which I got from a torrent
pretty much, I think it was copy the 2 directories onto the root level of your storage card, then restart the phone, it then finds the autorun file in the 2577 directory, and no I don't know why it's 2577.