slider, rules position and width

[Fabrice]

I would like use slider as bargraph, do you think it's easy to :
  - add slider width when displayed verticaly and slider height when displayed horizontaly
  - show/hide slider button
  - show different color from min to value
  - option to display rules à left/right
  - option to display value at left, right, center, top, bottom, value pos

Do you think it's possible to have one or all these options in future?