I'm not sure I agree with that. Playable races with different game styles is a major upgrade. It's a feature you can sell people on as being new and different from classic. Putting it on a stretch goal means you can't do that in the initial pitch.
I think it sells better than you do. Classic has no real equivalent to it, unlike a lot of the other stuff.
It's proof of concept than the game can be entirely modded. Which is basically the main new stuff in the sequel, moddability. Most of other changes, numerous and hardly discussed as they are, is refining what already exists into a sequel. And, yes, if the proof of concept works, mods auto-generate interest, money, fans, other stuff...
@my previous post... forget it. Frankly, Captain Jack's last post demotivates me, as much as this letter thing does. But it's not worth explaining it publicly. As tridus said, Chris'll choose what he wants anyway => completely agree with that.
Anyway, I think we should try working on point 4:
4. Anything you can do to help in terms of resolving the design document's many open ends would be appreciated.
Simply put, what's not in the document yet ?