Toss that idea in the update plate. I think they'll have to develop a user-accessible file system before you can do that, but I'm sure it will happen eventually. I was expecting that to be on it since it has full-blown OS X, but right now it doesn't feel that way. Right now there a a lot of gripes about not being able to copy/paste, download pictures or other web content, and many other things you would expect a device running a full OS to do.
But Apple wouldn't have bothered building a full OS unless they were planning to do big things with it. So, a little patience will surely pay off. (I hope)