Scrollable interface for 3.0?

[Shaun McCance <shaunm gnome org>]

http://library.gnome.org/devel/gtk/stable/GtkScrolledWindow.html#ftn.id1043260

  The scrolled window installs GtkAdjustment objects in the child
  window's slots using the set_scroll_adjustments_signal, found
  in GtkWidgetClass. (Conceptually, these widgets implement a
  "Scrollable" interface; because GTK+ 1.2 lacked interface support
  in the object system, this interface is hackily implemented as a
  signal in GtkWidgetClass. The GTK+ 2.0 object system would allow
  a clean implementation, but it wasn't worth breaking the API.)

Is this worth breaking API for in 3.0?

--
Shaun