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TPS1641: Valmet - EN Pin

Part Number: TPS1641
  1. It appears from images on the datasheet, that the EN pin is internally pulled up.  The specifications of EN/SHDN INPUT seem to show there is a max 10uA leakage (pull up), and the pin will approach 4.9V if left open.  However, none of the descriptions of the pin (which I could find at least) clearly stated it is OK to leave the pin floating.  I want to use the device as the input to my board, and I would like to have it automatically enabled on power up.  Is it OK to leave floating?  If floating, do I need to add an external capacitor to prevent radiated noise from causing a shutdown?