to agree with having an opt-out function, mostly for legitimate concerns like Pathoschilds.
Pathoshilds concern is not really valid. 1) per Mike.lifeguards comment, 2) we would not have to actively disseminate the code. The issue is sharing between toolserver users. Potentially harmful tools like pathoschild's (which seem to bee against TS rules anyways) cannot be kept from being distributed just through license terms in any case. Either you trust your fellow TS users, or if not, do not bring this kind of software to the toolserver in the first place.