I agree 100% on the immersion factor of different skins. I don't have the vaguest idea regarding the technical issues of this but I would love to see a choice of skins!
The whole immersion thing is a tough nut to crack... As I sit in my dining room, the kids in the background, my wife watching TV, the fridge 6 feet away stocked with cold beer, IMMERSION is a toughy!
That said, every little bit helps. Be it skins, terrain, changing seasons, whatever.
Damned Augie