Terrain Render Distance is fairly easy to find.
1. 4 Byte Value search in Cheat Engine for "current render distance setting - 1"
2. Repeat 1. until you got only ~20 results left
3. Look for the static one, its green (011047c0)
4. Check what writes to this address
5. You'll end up here (00A19C3E):

6. Scroll a little up till you see this:
Be careful when changing the float values. These might be used in other occasions and therefore might break other things. It's a good idea to add a new section to the binary where you store your own values.
Adding more settings would require adding more cases to that switch. The function is "not that complex", so maybe completely replacing it is a better option.
What I couldn't find yet is the fog of war, since that never moves.