Im using windows XP with VMware Fusion and trying to connect my Nikon Coolscan 8000 via Firewire 800 w/ Thunderbolt adapter. My virtual machine recognizes my Kodak Pakon scanner via USB and scans perfectly fine but my Nikon scanner is not recognized. Is there a way to get VMware to recognize my scanner via Thunderbolt?
You cannot pass-through thunderbolt to a VM and as such it cannot be made directly available to your guest.
Same for FireWire, there's no pass-through support for that either.
So the answer to your question is: No, not possible.