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Not that I'm aware of... unfortunately you're asking devices at the network layer (3) in the OSI model to read higher up the chain. If you try to tell Websense not to allow IP based FTP he'll block all access to it. Only thing I can think of is doing a whitelist of FTP sites.
Also I wouldn't worry too much about this... while what you say has been true in the past the latest and greatest malware is making use of DNS in order to provide better resiliency in the event their CoC servers are taken down. Heck more of them are using SSL / SSH to evade IDS/IPS. Websense Real Time Security Updates should be able to flag any known malicious hosts, and even better if you have WCG which will be scanning the content for malware.