Why would VAAI be the reason for your cloning issues ? If anything VAAI should improve cloning performance.
If VAAI isn't supported by your array, you dont need to do anything to disable it. Take a look at http://kb.vmware.com/kb/1021976
A quick google search on your array model led me to http://www.fujitsu.com/global/services/computing/storage/eternus/tools/. It seems that there is a VAAI plugin for your array. However do check with Fujitsu before trying it out.
To answer your question, it is possible to individually disable VAAI features - http://kb.vmware.com/kb/1033665