Thank you all for your responses. Something wasn't seeming right but I just didn't know why I couldn't find the option.
That being said, and I'll be playing devil's advocate here, there are other optional components in NAM that are, as you put it A Nonny Moose, personal; I don't see why a few of the better slope mods that the NAM team would approve wouldn't be able to be incorporated as optional installs in NAM. There are other optional components in NAM that you can only select one options that category, you could do the same with a slope mod.
I'm sure you guys have your reasons, including technical reasons which would probably go over my non-SC4 modding head. Just playing devils advocate but also genuinely asking as well because, as I'm sure others out there would agree, I would much rather trust your team's knowledge and expertise in whatever mods were vetted by you guys..
At any rate, thanks again!