Try using the multiple response item type instead of the scale response item type. Doing so will give you the continue button. Also, adding an r1-1 parameter makes it function just like a scale response but without the automatic continuation. e.g., for a 7pt scale, you would use:
Code:
(p7,r1-1)
Where r1-1 simply means a minimum and maximimum of 1 selection.

Hope that helps,
Blair