Well, you can't change the direction of the paddle/belt as they are "out of control"
But regarding ball/puck getting stuck: if you hit on wall or just try to get another angle on ball/puck, it'll be back in center
Also, the puck is moved through Physics so the part of paddle/belt from which you can apply most force will make it move faster whereas the area closer to character's body doesn't make it move. We didn't coded much for puck/ball, it's complete physics.
Hope you enjoyed the game! ^^