Small pieces:
Live groove: Don't know what that means, sorry.
Animated pit crews: Not yet, just a lollypop man. No pit stops yet outside of serving penalties.
What are the garage options on the different cars: Depends on the car. Rookie doesn't have any. Skip Barber lets you adjust ride height, camber, and tire pressures. I don't know what 1/2 of the stuff on the Radical means. I haven't played around with setups much because they haven't been that big of a factor yet, due to the cars I've been racing.
Are there day to night transitions: Not yet.
Is a spectator mode included: In practice/qualifying yes. In a race, I'm not sure because I haven't gotten out of my car during a race yet.
Weather - is rain included: Not at launch
Changeable weather: Not yet.
Clutch support: Yes
Driver changes: Not yet
Ability to join in qualy: Join what? There is qualifying if that's what you mean.
Ability to rejoin mid race: I believe so, if you get disconnected, but not positive.
Are non US character sets supported: unknown
Is telemetry included: Not yet.
What kind of driver stats can be displayed: In what sense? The sim keeps track of all official sessions, listing PBs for each car/track/session type (e.g. you have a practice, race, and qualify pb for each combo.) The sim keeps track of each race you do, and provides statistics like Starts, Wins, Top 5s, Poles, Avg Start, Avg Finish, Total Laps, Laps Led, Win %, etc. At the end of every official session (practice, race, qualify), you get a "scorecard" sorta thing. The sim keeps track of all of these and as far as I can tell you can retrieve the score card from any session you've ever done.
Can engines catch fire, drop oil etc.: No, there's currently no engine damage.
What Copy Protection System Is In Use? You launch everything from the website, so whatever you do has to be authenticated through there (including launching offline testing sessions).
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How good are the pings and racing from europe? Can't comment personally, but haven't heard any complaints.