Let's try approaching this issue from another point of view:
What motherboard do you have? What cooler do you have and how many fans are on it? And how do you want the rest of the case fans set up? Are there certain fans you would like to group up and control at the same time? (e.g., frontal intake fans are one group, top and rear exhaust fans are another group)
Looking at the Air 540, it has:
Front: (x3) 120mm or (x2) 140mm
Top: (x2) 120/140mm
Rear: (x1) 120/140mm
What I would do is use one splitter to connect the three frontal 120mm fans into one motherboard fan header, and another splitter to plug the remaining top and rear fans into another header. The motherboard only sees two fans, but each one ends up controlling three fans, one group for intake, and the other for exhaust. Setting the speed for one header would affect all fans connected to that header. Makes sense?
All you would need are two of these splitter cables that allow you to plug three fans into each header,
like this one from Newegg. You can probably find a similar one on ebay.