CTRL+C will still break into a long directory listing - e.g. do dir /s from the root and hit CTRL+C before the listing finishes on its own - haven't tried a script yet but I suspect it stil works.
Looks like CTRL+C will only do the copy when something is highlighted. If you do dir /s and then click and drag it halts the directory listing. Doing CTRL+C will copy the stuff highlighted and then the listing will continue. Do CTRL+C again and you break into the listing and stop it dead in its tracks.
Sort of like "operator overload", methinks!