Do you really need more than 2GB for app space? I have almost a hundred apps on my phone, including a couple Angry Birds games, Instagram, Facebook, Evernote and other big apps, and I'm still around 300MB used (on a 1GB partition). A phone with that much internal space doesn't need App2SD. That's for Optimus V owners who have to fight with a piddly 170MB of internal space.
Think of it as an internal partition. No App2SD or Link2SD needed. Use the SD card for music, pics, etc. Don't bother with putting apps on your SD card. You'll be fine.