FDC1004: Added capacitors to VDD, and to SHIELD

Part Number:FDC1004

We will be using the FDC1004 in an application that will be using around 40 sensors. 

1. What affect does adding the 1 uF and 0.1 uF capacitors to VDD?

2. In the FDC1004 user guide, the schematic shows the shields being shorted with 51 pF capacitors. If we are not using the shield pins, is it still necessary to use the capacitors?

Thank you,

Richard