I have only voiced my opinion, and as Im not in it, its for you guys to make your minds up as to what rules you want.
In the times that I have run, I have never run on slicks, mainly because my aim was to see how fast my street car was, and as I will never race a farrari or poker on slicks, Ive never seen the point, if I was playing with the unlimited, mods & power brigade I naturally would want all the help I could get. I have found it far more important to learn how to drive your car, than simply bolt on all the goodies. As this is a non tuner-limited budget bit of fun, just go out and play with the car you have and increase the power and mods as you improve your times. Like a gradual learning process.