I still think she should have given Touya a bit more warning before leaving. :/

I can forgive her for that, because it wasn't being flighty or intentionally selfish; she really thought he'd prefer not to spend their last months together anticipating her leaving.

Yuuko. They would angst and dwell on past things and ANGST.

Ohgod. If she heard Yuuko story, and Eriol hadn't split his power, she'd probably leave Eriol to avoid their relationship going the way of Clow/Yuuko and hurting both of them.

Choosing My Fate and yes I'm bitter about certain bits of fandom why do you ask.

I covered that a bit in the E/K manifesto, how Kaho puts her own wishes into her predictions to make them come true. and which segments?

Just your usual "oh noes I forgot about the exam!!!" dreams.

And now that's she's a teacher, they're probably "oops, I misplaced the exams! and forgot how to find the exam room!" dreams.