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[DoubleYou]

To update this for Skyrim SE, Bethesda added a new setting that controls this:

 

bDisableShadowJumps toggles whether or not sun-shadow movement is controlled dynamically outdoors, resulting in constantly moving and potentially flickering shadows in relation to the movement of the sun as time passes. Disabling this will result in sun-shadow movement being dictated by the fSunShadowUpdateTime and fSunUpdateThreshold settings, as utilized previously in the non-Special edition version of the game.

 

Skyrim.ini

[Display]
bDisableShadowJumps=0

[DoubleYou]

And another related setting:

 

Skyrim.ini

[Display]
fSunStaticTimeUpdateScale=0.1000

fSunStaticTimeUpdateScale is used when bDisableShadowJumps=1. It sets the amount of time in seconds that passes between updating the shadows with the sun. There is no transition using this method.

 

Ironically, since there is no transition used with the default bDisableShadowJumps method, it is more jumpy. However, with small value of fSunStaticTimeUpdateScale, as is default, it just provides a gradual movement, that although it flickers constantly, can be easily ignored.