Note that snaplines are used both for spacing (blue lines) and for alignment (pink lines).
Yes, you can control the amount of space the snaplines suggest, but you do this by altering the Margin and Padding properties of the controls.
If you slide one control toward another, the length of the snapline is the sum of the Margin of the two controls.
If you slide a control toward the border of its containing control, the length of the snapline is the sum of the Margin of the control and the Padding of the containing control.
This is discussed here.
Edit: There is a special case when the Form is the parent container and the Form's padding is 0,0,0,0.
Note
If the form's Padding property is set to 0,0,0,0, the Windows Forms Designer gives the form a shadowed Padding value of 9,9,9,9. To override this behavior, assign a value other than 0,0,0,0.
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