I'm sure they could, they just probably don't have enough interest to do it. It doesn't come with carpet in those areas from the factory, so my guess is that is why they didn't do it either.
Yeah, that's kinda what I figured too. Qtech only offers them in 2 colors, so I'm sure they aren't a popular option. I suppose one could just get a roll of ozite carpet and cut/glue their own in those sections if they so desired.