Dominos also allows you to change the number of buttons per bar. Its "/dom numbuttons 14" I use it with my n52te. It doesn't really mention that in the description but it is on the
Wiki page
/dom numbars 1-120 Sets how many action bars to use. This option will reset your action bar positions
/dom numbuttons 1-120 Sets the maximum amount of buttons per actionbar. This option will reset your action bar positions