A few days ago I would have said Gripshift is junk too, but when I actually played the real game instead of the demo, for some reason I started to love it. I especially love that you always have to do something tricky to get the fastest time possible.
Back to the point at hand... Using PS3.ProxyServer is actually very easy, especially if you use the English version. I like it a lot better than 3r1c's version because you can use the firmware update bypass, and you can also sniff other links, such as the PS3 connecting to DNAS.
You can click and search for your files in CF3B5's version too. You just have to sniff (or already know) one URL first.