That's one way of doing it. Unless you want the position to be different than (0.5,0.5), then you can animate the shake min/max values to whatever position you need it to be. Of course you can also turn off the lock x/y checkbox so you can animate the min/max values of the x/y seperately, so you can also stop the shaking at (0.25, 0.33) for example.
Setting the smoothness to something like 50000 will also just about freeze the position.