Even though I can agree with the sysv init aspect, there's nothing in the two different ways of disabling the crawler that is in any way better or worse for the package, certainly nothing that'll cause trouble with the debian packaging system. It'll be a hack any which way it's done, and there are other ways too. The way I would prefer is really to dpkg --purge the whole package, as to me it's mostly junk. Didn't try that though, so I don't know if something else is set to depend on it.