Add on,
1) A field to enter the number of graphics card, that way it's a bit easier to see btc/per day and coins per day for people with multiple cards
2) An option to show 8 decimal points instead of 9 for the price
3) Retain previous session input value. E.g I input API key. After i close and reopen i dont have to input key again. Same goes for any input value. It retain previous session value. Something like save setting
4) To allow to display profit based on 1 hour average , 3 hour , 6 hour , 24 hour average (using difficulties , similar to whatmine.com). The reason for this is because many coins difficulties have very big swing. JPC can be 500 this moment and 800 the next. It will shows us what to mine for the next couple of hours to a day instead of what to mine right now.
1) Added on the to-do list
2) Added, will just make it 8 decimals

.
3) Added.
4) This would require continuous monitoring of the API's, and I might add this if I get that finished in the profit switcher, but not in it for now

For 3), could you create a .txt file where we could input our API keys, and the calculator could pull the values from there and input them into the API key fields?