pos damage if I shear the crank Damp Key???

I have read in many statements that the belt is supposed to be enough.I ran a crank hub only for 8 years,but had issues.Now I intalled an ATI superdamper to see if it will eliminate the issues from my past.But I was plyin' in a slightly higher HP range than you will be untill you double key that crank or get a nice stroker.You say you will only use a little,but that like sayin' your only gunna put it in just alittle:la: Your gunna just tease yourself,change a pulley and get in trouble:book:You HAVE to limit your self to maybe 5lbs of boost,,,,,,,,,,that's IT!!