I'm really trying to figure out if there's a way to toggle the unit classification (flying / ground / hero) in-game, and also if there's a way to toggle the field of a unit refered to by the "targeted as" field in the Object Editor. Can I change a unit that's "targeted as : GROUND" to "targeted as : AIR" in-game?
No way to toggle between flying/ground/hero in game (aside from changing to a different unit type, with a morph spell ground<=>flying, ala DotT, though doing it from non-hero<=>hero will almost certainly go horribly wrong).