I'm not a person who works with NICs here at Intel but I have played with Server Core quite a bit. I've asked Microsoft very similar questions and they seem to always point me to the registry. Take a look there and see if you see any options there to enable those properties. I don't have one of those NICs to play with myself so I can't advise on what settings to look at.
Hope that leads you in the right direction...and maybe someone else will hop on here and let us both know if there are specific keys that need to be added.
There's a document on Intel(R) support that covers configuring advanced features in Windows* 2008 core. It might be able to answer some of your questions.