b737ng roll control
Yes eng123. You are correct in saying that they are on the same cable. HOWEVER.......... I am assuming you are an engineer yourself? If you are, well, then you would know how you adjust the spoilers, and that they ARE progressive in their raising as this happens when you adjust the pick up at the spoiler itself. This adjustment determines the individual point at which each spoiler panel will lift, as as said before, when the aileron wheel is turned a little(cant remember the exact figures), the inboard will start to rise first, followed by the next and so on, until you reach a point in which the aileron control wheel is turned and all spoilers will be fully extended, but they have different "full extended" angles.
Hopes this clarifies this for you.