Whishlists, (Sometimes known as Idea Lists) are lists that the community (both users and non-users) can contribute to for ideas that they think should belong in an upcoming game that will most likely be made.
How To Contribute
Place your idea in the correct area on the idea list you would like to contribute to (i.e. Easter Eggs, campaign, multiplayer, etc.) and then sign your name following the idea.
Feel free to create your own whishlist for a game you think could one day be in development or is in development right now. If you are unsure about a game, contact one of the top contributors or admins on the Wiki.