You have developed a beautiful hand graphic used when displaying the opening lead problem. However on many touch screens it can be very difficult to choose a lead from the hand because the space available for each card is very narrow. Would it be possible to use the letters/numbers in the hand diagram itself to make the card choice? Would involve making the letter/number an action button. This would make touch screen usability much better than today. Not a big benefit for users with a mouse and cursor. (Spoken as an iPhone user of this site).
Plus... it's free!