Weight: 0.23 oz
Size (LxWxH): 1.78 in x 1.78 in x 0.00 in
The capsense scroll wheel interface is a square PCB with 10 copper sensor pads. You could connect your capacitive sensing circuitry to it using a 12 pin surface mount connector on the back side of the PCB.
The Board has provision for a center momentary switch. A schematics and optional components recomendations are shown on the datasheet.