Flash MX 2004.
stroke.waveHeight
Property; a string that specifies the wave height of a ragged line. This property is available only if the stroke.style property is set to ragged (see stroke.style). Acceptable values are "flat", "wavy", "very wavy", and "wild".
The following example sets the waveHeight property to flat for a stroke style of ragged:
var myStroke = fl.getDocumentDOM().getCustomStroke();
myStroke.style = "ragged";
myStroke.pattern = "random";
myStroke.waveHeight = "flat";
myStroke.waveLength = "short";
fl.getDocumentDOM().setCustomStroke(myStroke);