Quickly want to check with you is FT supports more than one vCPU in ESXi 5.1
No it does not support.
FT FAQ : http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=101342...
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As per the VMware document, the answer is NO. See the second last point below.
The answer is NO
Please check the FAQs: