Unequal increments in GtkScale or Spin Button

[Pramathesh Ambasta <pramathesh ambasta gmail com>]

Hi list.

Is it possible to specify unequal increments or decrements in
scale/range/spinbuttons or adjustments? 

By that I mean, for example, if the up-arrow of a spin button is
pressed, instead of increasing the value by a fixed increment, I change
it by arbitrary values - say the value changes from 10 to 16 to 18 to 32
to 60 and so on?

Thanks in advance

Pramathesh