Quote:

I have done it both ways. never felt any difference. so do what ever you fill safe with. but if a car got sideways with out the slicks having screws could the tire come off the bead that would been one of my fears



If you are so far sideways traveling at a speed at which you feel the tire will come off the bead, you probably have bigger problems.
That being said, I'll say it again, each individual driver needs to feel comfortable with balancing a tire or not.