I've played 1-3. I am surprised you ask this question, because I've told you some things about GT gameplay in the past.

Good. As for the Tokyo track, try wallriding it. I know, there's damage in GT now, but apparently wallriding is still an effective technique (if the magazine M!Games is to be trusted). I don't think this holds up for endurance races though.

EDIT: Nevermind, I misread your Tokyo track question.

I have to say what annoys me is that you cant save half way through a series if my parents call me off and i have to start all over again. also that you cant restart in a series. so if you have gold in all but then make a big mistake on the last lap of the last race (which i have done) you know you will now get 2nd place overall or less you cant just resart that race no you have to either get less than you deserve or resart the whole championship. After 6 years of develpoment it annoys me that these two simple features dont exist!!!