Can I turn off XHCI on new Mac PRO?

I am interested to get a new Mac Pro. I am a bit disappointed that there are only four USB3 Ports. I know that there are expansion appliances and devices that will provide a few more. here is my issue, which will determine if I am a buyer:
I will need to turn off XHCI, reverting to USB2, and hopefully on a port-by-port basis. Now before anyone jumps up and tries to tell me that XHCI will support USB2, I can tell you for provable certainty that XHCI is not truly backwards compatible with USB2. USB2 is an emulation under XHCI. There are some devices that will not run under such an emulation. One of them is the Microtelecom Perseus SDR Radio. I am a collector and SWL enthusiast of 35+ year duration. SDR (Software Defined Radio) is the newest, and very exciting development in Radio. Few are made with MAC OS compatibility, so I run them in Virtual Machines, under Parallels. This works handsomely on my Mac Pro 1.1. But my Mac Pro is long in the tooth. I would like to replace it with a new Mac Pro. But only if I can turn off XHCI. Also please do not wax on about how the manufacturers of such devices should upgrade to USB3. That is not an option for radios that were made 10 years ago.
There must be a way to do this. Apple must certainly want to market the Mac Pro to the Scientific Community, many of whom have devices which are USB2, and finicky about their connections.
I would prefer to turn off XHCI on a port-by-port basis, or to find an extension/expansion device that is not a simple passthrough of USB.
I asked this question at the Apple Store here in San Francisco today, and no one had an answer, or knew what I was talking about. My question was escalated twice to supposedly more knowable persons, none of whom had any idea what XHCI is.
Anyone here know?

No response here in 3 days, so no one knows.
I did manage after a few tries to get an Apple Tech on the phone through the Sales Dep't. He said that there is no way in the Mac OS to disable XHCI settings, and while he recognized that PCs offer control through BIOS, that Apple offers no access to BIOS. He said further that one might discover a way through the Terminal app, but that Apple would not support that if done by a user. So I am NOT going to spend $3500+ on a new computer to have to hack it, and put Support and Warranty in jeopardy. No new Mac Pro for me, no sale for Apple. I may look for a refurb or eBay used Mac Pro 3,1-4,1-5,1, where I can drop in a PCIe USB3 card, and have both for my use, as I wish; nine hardware USB ports sounds good to me.

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