TPS2116: Reverse Current blocking with battery

Tool/software:

Hello -

I am considering using the TPS2116 as a power MUX in the following application.  We have a device that can be powered in three ways (decided by the installer)

Method 1:  DC hardwired from a 5V LDO (no battery).  With this method, VIN1 = 5V, VIN2 is floating

Method 2:  CR123A battery only (no hardwired power)  With this method, VIN1 is floating, VIN2 = 2-3.3V

Method 3:  DC hardwired from 5V LDO with CR123A battery for backup.  With this method, VIN = 5V, VIN2 = 2-3.3V

For the first two methods, I'm pretty confident this is fine, and the leakage current for method 2 is acceptable.

I am concerned about reverse current blockage for Method 3, the battery is non rechargeable and the current flowing from VIN1 into the battery must be kept well below 1uA.

I see the reverse leakage spec table, but it is specified for VOUT = 5.5V, VIN1 = 0V, VIN2 = Open.  Which is different from our case of VOUT = 5V, Vin1 = 5V, Vin2 = 2 to 3.3V

My questions are: 

#1)  How does the reverse current blocking work in this case.  Is there any leakage current out of Vin2 (even in the nA range?)

#2)  There is no Reverse Polarity Protection on this product, correct?  So we would need an (ideal) diode on VIN2?  Is there any PowerMUX with this integrated feature?

Thank you