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TPS631012: Exploiting Reverse Current Mode

Part Number: TPS631012

Tool/software:

Hello, 

Reverse current mode in FPWM mode is supported by the device. 

In this mode of op, Q1 / Q4 are on with 100% duty cycle? or 

For a certain application, normally PFM mode is preferred because light load efficiency is preferred. 
However allowing reverse current into the device with a built in current limit could theoretically be used for lithium ion charging with safety. 

Is this reverse op use case possible and are there other considerations?