Changing parameters of multiple different objects at once

[Gunny]

I often struggle with choosing the "right" widths of strokes and contours so I keep changing them throughout the process.
Unfortunately Designer is not really sensitive with them.

If you select several strokes at once and change their width Designer sets the width of all of them to the same value. It makes sense but I often want to keep the ratios between the thick and the thin stokes so I suggest some possible solutions:

1. Add an checkbox "Adjust average value"

With this option On you would change the average value of the selected group and the values of each member would change proportionally.
(I.e. average 5->10, stroke A 4->8, stroke B 7->14)

2. Slider with two (or even three) control points

I like this option more because it would give me a better control and it would be universal.
With a group of many different strokes the first control point would represent the minimal existing value and the second point the maximum (they could use slightly different colours, etc.). Moving any of these points would spread all the values. You can also merge both control points together and set all strokes to the same values.

You could even add the third (middle) control point representing the average to make the transformation function a curve.

3. Two (or more) sliders

These would basically handle the same thing as suggestion 2 but they would require additional space so I think two-point slider would be more convenient from the designer's point of view.

I am talking mostly about the width of strokes but I am sure the extended two-point slider would be useful for many other group values.