1\Yes. The team edition still come with the torque screws and driver
2\i think it's diff's in front and rear... if you want one-way u have to buy it separately
3\here you will have a problem!!
i think that's no exaust system that will work with a SE Engine on r12.. but let's wait for a more expertise person to answer this!!
4\try to contact schumacher directly... www.racing-cars.com
5\dont know what axle are you refering to...
Personally, i think that r12 is a great car, especialy the price!!
(it cost me about 300$ with the rossi pixy 3t!); and the frrreeeeeeely drive train!! aahh !! and off course the no PITA 2-speed transmission!