I really see no reason to upgrade to 2.1, either. I'm happily using 1.1, which has all the math features I'll ever need. The power bug is rather annoying, though.
We can probably write our own 3D grapher in C. I've been thinking about writing one myself, but it seems rather futile at this point since we don't have any way to input the function being graphed.

bwang, you could use a method like in the screen shot below, allowing users to add numbers/variables to the equation by navigating through the numbers with the arrow keys, adding the corresponding number when enter is pressed.