What exactly does D4 ON/OFF Do... Toyota Prius V 2014

Question

So the manual says "Program bypass Option(Vehicle hybrid only):  D4  Description: Hybrid mode
The fact that is is a 'bypass', it being 'on', is that disabling hybrid in the remote start?   Same goes for the D6 "Push To Start".. It's not clear what effect leaving the flag on/off will do.
I want the car to stay in hybrid-mode at all times( engine only run when drive battery is depleted )

Answer 1

D4 HYBRID MODE
Sets the UNIT to be used on Hybrid Vehicles that do not generate a proper tach signal. The UNIT will emulate a tach signal as soon as it detect that the hybrid vehicle is in “Ready to be driven” state. Both on its analog output and through Datalink

Answer 2

Turning the feature on enables the feature, turning it off disables it.

If you car is push-to-start and hybrid turn them on.