Question is in the title.
Imagine you have many bigwig track...and you want to display  the same scale for each tracks but you don't want to change viewlimits one by one for all of them.
Is there a way to do that in a one time shot for all using maybe session file or Supertrack ,multiwig, composite arguments.
You can check the "Oct. 11, 2019    New "group auto-scale" option" [here][1].

Example track file for group of tracks:
  [1]: http://genome.ucsc.edu/goldenPath/newsarch.html#101119


     
 
 bigWig 

    track myComposite  
    compositeTrack on  
    shortLabel test 
    longLabel my_comp_testing
    type bigWig  


        track myFirstSubtrack
        parent myComposite on
        shortLabel test_1_short
        longLabel tes_1_long
        type bigWig
        visibility full
        maxHeightPixels 70:70:32
        configurable on
        autoScale off
        viewLimits 0.0:1.0
        alwaysZero on
        priority 0.1
        bigDataUrl file1.bw
        color 0,0,0


        track mySecondSubtrack
        parent myComposite on
        shortLabel test_2_short
        longLabel tes_2_long
        type bigWig
        visibility full
        maxHeightPixels 70:70:32
        configurable on
        autoScale off
        viewLimits 0.0:1.0
        alwaysZero on
        priority 0.1
        bigDataUrl file2.bw
        color 0,0,255
```
