I have built a street with rails in my Sever. The player can drive on the road, but they are sometimes crash against each other The players should be able to control the Minecart with WASD
For a plugin like that you definitely need Spout and Spoutcraft, otherwise there is no way to get pressed keys from a player. Edit: V10lator was faster
Yea, because a boat is made movable with WASD in minecraft itself. Plugin developers can only work with thinks available in MC/bukkit and as there is no task to move a cart through WASD in MC itself... a server can't trigger this, so you need a client mod, too.