It's only right that, during your opponent's turns, you're trying to figure out what you want to do. That way, when it gets to your turn, you have a plan and can keep the game moving along. However, Dark Alliances, a new expansion for A War of Whispers expands on that notion and actually gives you dark deeds that you can plan. However, each one comes at a cost. The Kickstarter campaign for this expansion also includes a Collector's Edition of the base game.
From the campaign:
The Dark Alliances expansion pack allows you to plan in the shadows during other players' turns. Each card grants an advantage but comes with a price. Add this to your first edition of A War of Whispers or get it with the new Collector's Edition!
The campaign's around 3x funded with 14 days left to go.