First of all, thanks for making the calculator, which is great and very helpful.
I was using the calculator the evaluate deal and discuss with dealers. I think one feature will be very helpful: Make a form including more details, such as Net cap cost, cap cost reduction, lease charge (interest), with similar format as the dealers use.
So that (1) It can educate user, to let us understand meaning of each table from the dealer; (2) this can help negotiate with dealer. It is not convenient to show the Calculator to dealer directly, but may be easier to show them a form with similar format as they proposed (but with numbers we want).
I hope I explain the idea clear enough. Just my two cents. And thanks again for making the Calculator.