Currently all of the history graphs auto scale, but for items such as wind direction, it make little sense to auto scale down to +/- 5 degrees. I would prefer in that case of a fixed scale 0-360 degrees. The option of settomg a fixed scaling would allow use of an ailing sensor with wild data points (ie 85C for the w1thermsensor).
The feature request is for a scaling option autoscale or fixed with high/low limits.