I created these videos a while ago, and finally uploaded them to Youtube for your viewing pleasure. Most are linked on the INI guides, but I think one or two are not.
Skyrim.ini
Smooth sun-shadow transitions
fSunShadowUpdateTime sets the speed of sun-shadow transitions in seconds. It is recommended to be adjusted to minimize the transitions.
fSunUpdateThreshold sets the time between sun-shadow transitions. A value of 0.05 is equal to 1 second, so a value of 1 equals 20 seconds. Increasing this also increases the distance the shadows will move during the transition. It is recommended to be adjusted to minimize the transitions.
Default Sun Shadows
fSunShadowUpdateTime=1
fSunUpdateThreshold=0.5
STEP Tweaked Sun Shadows
fSunShadowUpdateTime=0.25
fSunUpdateThreshold=1.5
Other Various Tweaked Sun Shadows
fSunShadowUpdateTime=0
fSunUpdateThreshold=0
https://www.youtube.com/watch?v=3b0bQ3i--ks
fSunShadowUpdateTime=1
fSunUpdateThreshold=0
https://www.youtube.com/watch?v=Pl4MOCHE_wk
fSunShadowUpdateTime=0
fSunUpdateThreshold=2
https://www.youtube.com/watch?v=Ot7ciNOlxVo
fSunShadowUpdateTime=0.5
fSunUpdateThreshold=0.05
https://www.youtube.com/watch?v=OZPFrnV42s8
fSunShadowUpdateTime=0.5
fSunUpdateThreshold=1
https://www.youtube.com/watch?v=muVKsRlg9AM
fSunShadowUpdateTime=1
fSunUpdateThreshold=1
https://www.youtube.com/watch?v=jvjqG8RFoaM
fSunShadowUpdateTime=2
fSunUpdateThreshold=0.5
https://www.youtube.com/watch?v=9dJN0zuPDHI