I was about to post something about this IS discussion also. I think reading the thread that has recently been locked brings up more questions than answers. It looks like it kind of got into a pissing contest but not letting a discussions(or yelling match) on if this software could or could not get your accounts banned.

I think it comes down to this. Have blues in the past said keyclone(by name) is ok to us? If this is the case then it seems pretty simple. IS would be completely safe once a blue refers to it by name.