I completely understand the need for s spec slash class for all those guys and gals that bought spec slashes to run in that class.
Maybe for the first week or two, run all spec SCT's together. Then, after the second week or before the beginning of the third week, ask people what should be done for a points series... if they want to run them together or not. After a couple weeks, people should have a pretty good idea if they feel comfortable running the different RTR SCT's together or not. Just an idea.