That command must be limited to certain versions of OperServ. OperServ on my network doesn't have that feature.
In any case, a *@host type akill wouldn't be very effective against cloners. Each host is already limited to a certain number of connections (2-3 usually), so to be effective, the clonebots connect from infected machines from hundreds of different hosts.
One script that would work somewhat effectively, is one that loops through all users in a channel (or on the whole network), tests whether they match the given criteria (such as a wildcard match on their nick or ident), then adds a shun/akill for their specific hostmask.
-genius_at_work
