There are two separate issues here:

1) Springs are used to absorb any lateral shock produced by stones, etc. and prevent the instant high forces to reach the gears of the servo (or the rudder, if it is part of the linkage's chain).
That is achieved at the expense of the solidness of the command.
To use springs or not depends on the strength of the servo and linkages.

2) The deflection of the wheel can be made bigger than the deflection of the rudder, simply by choosing a different layout of arms (more arm for the servo and less arm for the wheel).
That makes the servo "feel" the lateral shocks stronger, though.