I'm glad I was able to help you, let's see if I can get you some answers on these questions. All of these requests can be done but would require some minor customization.
1, The program was not designed to do that, but this can be done by customizing the screen and adding in a function that copy's all fields and data, then paste it into a new page.
2, This would also be possible but would require customization, this would be done with the action "Basic Math Calculation"
3, This would be similar to the last question, using the math function will get the results you're looking for.