IWBNI there were an option to specify that when music is respaced, slurs should be automatically reshaped to conform to settings on the Slur Contour dialog box.

Note: When music is respaced, the length of slurs may be changed, and the shape of a slur is a function of its length.

This could be implemented by adding the following controls to the Music Spacing Options dialog box:

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Music Spacing Options Dialog Box

Reshape Slurs:
( ) All Slurs
( ) Only If Not Reshaped Manually
( ) No Slurs
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A given slur is said to be "reshaped manually" if any of the following operations has been performed on the control points that are within the bounding rectangle of the slur:

• The height of the slur has been modified by dragging the outer, middle control point.

 
• The inset of the slur has been modified by pressing Ctrl while dragging the left or right control point.

 
• The slur has been made asymmetrical by pressing Ctrl while dragging the outer, middle control point.