Here some suggestion:
1: Super Open Series
Any thing goes brush or brushles. Rubber or Form tire also can. Any body TC or Lola can can. ANY Battery. MAY THE BEST AND WILLING TO SPEND WIN and of course Driving Skill must be good also.
2. 23T Stock Motor Open Series: Need to control the motor here. They are some very clever guys out there can super charge their Stock motor?? Instead of Whole Series use one type of brand of Stock motor. Can use one Type of Stock motor for one race. And another type and brand of Stock motor for next race. Tire can one race rubber next one form. (you'll go crazy with car set up. or buy more than one car for different setup

) Battery no control. Most will use GP ???: Race duration 7 or 8 mintue. Like Japan EP race. 8 mintues is very popular there.
3. Limited Close Open.
Control one element of EP car. Can control one thing: close Battery, or Motor or Tire?
4. Limited Close 23T Stock Motor open.
control one element of EP car stuff. Same as no.3
so EP guys what do you think?