Comment 5 for bug 895342

Spy: Umm, not sure about cellspread carrying owner for the mind control logic, but possible if it does with the already implemented permanent mind control flag.
Athena Cannon: Shields are already being implemented IIRC.
Mirage Tank: Could be a major source of lag.
Terror Drone: Possible with EMP logic.
Bullfrog: Like the paradrop weapon thingy that works in vanilla?
Shapeshifting Japanese Vehicles: Most of these are covered by an existing feature request on turning units from one type into another. Siege Chopper code may also make this possible anyway.
Cryo Legionnaire: Can be done in vanilla, just use mutation for infantry to turn them into "frozen" infantry with a shattering death sequence and a parasite weapon.