Full defense options, what's allowed for astral/vehicle/etc.? Options

[kerbarian]

I'm not clear on exactly what options are allowed for full defense in a few different situations:

"Full Parry" is one of the full defense options, but the melee combat rules distinguish parrying (with a wielded weapon) from blocking (defending with Unarmed Combat). Does that mean that since "Full Block" isn't listed as a full defense option, you could roll Reaction + Blades + Blades for full defense, but you couldn't roll Reaction + Unarmed + Unarmed?

The section on astral combat doesn't mention full defense at all, that I can see. Adding Dodge would work for astral full defense, but would it also be possible to add Astral Combat for the astral equivalent of "Full Parry"? Could you perform a Gymnastics dodge in astral space? Is there anything in the RAW that mentions this stuff one way or the other?

When performing full defense with a vehicle (evasive driving), it looks like drivers add their vehicle skill, drones add their Defense autosoft, and jumped-in riggers add Dodge (per the FAQ). Is that correct? It seems a little odd that physical drivers would be able to use their vehicle skill, but riggers wouldn't have that option.