Its only meaningful if you have the ability to change it in flight.

Many radios have "Dual Rate" switches, usually for elevator and ailerons. "normal" rate is the full normal travel of the servo with no computer adjustment... 100%. This is also called high rate. Low rate is a reduced amount for more precision.

The normal throws, especially the way some people set up Fun Fly planes, can be excessive for take-off and landing, or even attempting smooth level flight. Just touching the stick can make the plane jump. The dual rates are especially helpful in trimming and test flying these types.

Having the dual rate set for a desired maximum roll rate and the desired diameter of a loop can be helful for precision aerobatics too.

You'll note i don't advocate the normal being anything other than 100% servo normal travel. Reduced is somewhat akin to using a lower power servo with a sloppier linkage. If you are normally flying with the ailerons set for 50% travel, you are flying with 4 times the effective slop in the linkages, and 1/2 the servo power available being used. Move the clevice in at the servo and out at the control horn and the play in the linkages and gear train allows less travel, and you have the ability to use the full power of the servo. setting higher than 100%... you are exceeding the design travel of the servo, and could potentially damage the position sensing pot. (Even though most servos are OK at up to 125%... its still a bad habit to get into.)