Feature: Allow the user to Right Click to send a card to the best available target pile (especially in Spider Solitaire)
The best way to see this in action is to view an example. The example I have is Spider Solitaire for Android by "MobilityWare", available for free from Google Play Store.
I also remember in the distant past around 1997 playing Spider Solitaire in the unix lab at university. That game also had the same feature.
The user should be able to Right Click on a card and the game should automatically move that card to the best choice target pile. i.e. If the available face cards in Spider Solitaire are: 2, 3, 4, 5, 6, 7, 8, 9, 10 - all of Spades; Plus 5 of Hearts as the last card - the user should be able to click 4 of Spades and the game will auto place that card on top of 5 of Spades as it is the best choice.