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Similar to this, But i want a slider that adjusts the mean twist of the curve. As stated in that post the content I need is defined outside of Python API, I and would have to write an operator to do it. I can do that, but I need to know how to do the calculation for the mean twist.

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I figured it out. I made a FloatProperty and put the function I was going to write as the update:

bpy.types.Curve.mean_twist = FloatProperty(name='Mean Twist', step=10.0, default=mean, unit='ROTATION', update=get_twist)

Then I wrote the function which got the average tilt of all the points, subtracted that from the floatproperty to get the difference after the change, and added that to all the tilts: tilt + (floatproperty-averagetilt)

def get_twist(self, context):
    cur = bpy.context.active_object.data
    points = cur.splines.active.bezier_points
    rot = cur.mean_twist
    tilts = [p.tilt for p in points]
    mean = sum(tilts)/len(points)
    new_twist = [t + rot - mean for t in tilts]
    points.foreach_set('tilt', new_twist)

Then I just added the float property to a panel as a slider. It changes the actual mean twist and works in Object mode.

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