Lower torque can act as a servo saver.
A seperate torque and velocity setting would be ideal.
Backlash or windup compensation would be awesome.
being able to position to external potentiometer would be awesome.
control over the acceleration and deceleration rates of the servo would be great.
speed sensitive steering would be great.
being able to log current and position would be great.
having torque limits would be phenomenal.
Having an automated response to dead heading or over torque the servo would be great.

yea, one or two programmable options would be great.

or create a programmable velocity and position loop so that it opens up all motion control possibilities for different vehicles, tracks, and driving styles.