@Ascho,
Try this:
# Surface number where properties are adjusted
surfaceNumber = 3
# Retrieve surface where properties are adjusted
mySurface = TheSystem.LDE.GetSurfaceAt(surfaceNumber)
# Get Tilt/Decenter properties of the surface
myTiltDecenterData = mySurface.TiltDecenterData
# Set After Surface property to pickup
myTiltDecenterData.SetAfterSurfaceModePickupThis()
These are the other functions and properties of the TiltDecenterData:

Hope this helps and take care,
David
Thank you so much.
It was very helpful for me.