I don't really see why you need more... You've got all the basic ones that can be used in most posts, if you really want more, then they'll be more specific things, which wouldn't be used much and you're more likely to find one you want/like on another site rather than having a million and one smilies for every possible post.
I may not be here as much as I used to be, but for the two years I was really active, I used the smilies we have now, as did everyone else...
If you want to post up your own images, just look in your MSN folder for the images and upload them. Might work, not sure about the GIFs though.