Geez. i don't understand why you aren't among the "1000" votes, or at least the 100 vote saves. This is amazing, and tests the potential of powdertoy hugely. Praise be to you! I can't say enough things about this calc!
No idea really. I am not sure if many people realize the difference between this calculator and other calculators.
To my knowledge, this is the first calculator that can add and subtract multiple times without resetting, while other calculators can only perform addition or subtraction once before a reset is required.