Shopping Cart in Client Store

Hopefully its not asking for too much, but a shopping cart would be nice to keep track of how much rp we need to buy (or save up for). When adding champions too the cart, maybe there can be an option of choosing between rp or ip and have a total calculated down bottom. (insert just use a calculator comment here) Again, its not a necessary feature, but it'd be a nice thing to have. Maybe some ideas you guys can add?