just to go against the comen veiw
i always go for a hard tyre compond e.g macadams,020's or azaro sts
i can still get my knee down with out to much of a problem
can take them right to the edge of the tyre
but getting back to the original question, for me the main reason for prefering these over a stickier sports tyre is that they will slide earlier than a sports tyre and in a more controlled maner
i can quite happily go round some of my favorite twistys and feel the feed back from both wheels and it is always very consistent
with a sticky tyre there is always the danger of them letting go of the road whitch is always going to be a lot further than my hard tyres will go, but where a hard tyre will walk a sticky one can just go out as you find it's limit
obviosly a sticky tyre is always going to be better for a person that can really ride a bike and know it's/his limits but for me on an st2 i like some thing to tell me when i'm pushing my luck
please dont all shout it's only an opinion
