Here's a greatly expanded version of the \shape function, and another
function for specifying where slur ends should be attached to notes.
Please see .pdf files for more information.
Both functions are ready to be used, but they need testing; they are not considered stable yet and their behaviour may change.
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Implement a mode for specifying control-point positions relative to NoteColumn's Stem.
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Avoid collisions with Stems and NoteHeads when using 'head' mode.
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Implement a mode for specifying inner control-point positions relative to outer points' positions.
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for displaying controlpoints - show coordinates of each point, maybe in the format used? (i.e. polar, offset, absolute...)