[Illuminated One]

ad 4.)

All remote rituals are anonymous.
So you can only make educated guesses about the casting nation by looking at the magic and research the spell requires.
If you want to remain anonymous it's best to cast spells you cannot cast naturally and let someone who can take the blaim.

ad 8.)

I don't know, there was some thread about the battle behaviour of flyers way ago, I can't remember the conclusion but one thing is certain that fliers set to attack rear will often get stuck on the frontline (since the unit makes some kind of morale check or so).