Sorry, I tried and am unable to find proper tools or methods to safely edit this kind of BIOS like we'd normally do when editing a BIOS.
The BIOS can be dumped with Phoenixtool to look around at all the files contained inside, but what you see around the net is mostly correct.
Intel BIOS are compressed and encrypted with a signed file, so even if we edit you wouldn't be able to flash
Some things can be changed, but not a lot, with the tool mentioned below
Also, Intel Integrator Toolkit will allow you to change some settings, but none exactly regarding what you mention.
I used version 126.96.36.1990, but versions 188.8.131.528 and 184.108.40.2065 will open it as well by running an older version they contain internally
I can enable VT & VT-d, but it looks like both are settings that are already currently visible to you and that you can enable if you want, correct?
I did find this, that only when certain CPU's are used the VT-D/VT-x will then show up in BIOS automatically (QX9775 + e5450, probably others too but those are the ones they seemed to confirm after testing)
* Edit 1 - Most issues, CPU related are probably corrected by now in newer microcodes. All the microcodes in this BIOS are 2007-2009, your CPUID 1067A has 2015 microcodes available.
I'm trying to find a way to update them for you, normal methods of course do not apply here because Intel hates it's customers
If you had a USB Flash programmer, you can easily dump (backup) your currently flashed BIOS and the modify and reprogram.
This board has socketed BIOS, so no soldering required for that type of programming or recovery etc.
That is the only way I know to easily update the CPU microcodes for this BIOS, all of the stock ones have updated 2010-2015 microcodes.
*Edit 2 -
I think I can update your microcodes! But, you will need a flash programmer, because I don't think you will be able to flash edited file.
It's best to get one now anyway for recovery purposes in case you need in the future, they only cost usually $3-6
This is older BIOS, so maybe Intel not as strict on flashing back then, you can try once I finish editing and see how it goes.
I will add file here w/ more info soon as I'm done
*Edit 3 - Here is modified BIOS, with latest Intel CPU microcodes. I am unsure if you can flash this with normal Intel methods, after mod I am unable to open in Intel tool mentioned above.
But I do not have matching ITK file for this specific "rebuild" like I did have for original file which allowed the tool to open the BIOS. Original and modified BIOS open exactly the same now in EUFITool
A few mods versions before this final one I'm linking that did not happen, I had to try a few ways before finding proper method to where it opened properly and matching same as the original.
Please flash at your own risk, it is untested and I suggest having a CH341A USB programmer before flashing, in case you need to recover.
I suggest getting one of those anyway, because it's really the best way to redo this, and may be the only way you can actually use/ flash (ie program with CH341A) this onto a BIOS chip no matter what.
I'm sure the Intel signature and encryption security stuff will stop normal Intel tools from flashing with this file.
Old left - New on right
Number of microcodes differ due to Intel combining some of the 10676 platforms in newer microcodes. Old BIOS had 0+4 separately, now in newer microcodes 0,4,7 are all in one.
Due to that one less, and how this BIOS duplicates microcodes in two volumes, it looks like two less but it's all the same only now up to date.