Saudi Arabia and Iran
Saudi Arabia's game address starts with 1845. The addresses I found were the following: 18452E64 (Oil); and, 18451EBC (Inflation).
Iran's game address starts with 13F2. The addresses I found were the following: 13F263BC (Oil); and, 13F25414 (Inflation).
Setting the Oil production to about a trillion toe should give you over 99% of the worlds Oil production. I tried 100 trillion toe with the US, and it seemed to be counterproductive... my budget surplus percentage was 3 times higher with just one trillion toe. So the game probably only recognizes so much production to a point.
I'm not sure of the effects of a partial versus full nationalized product, but you will be able to determine what's more productive for which ever country you're playing with. The US for example, (with a trillion toe Oil production) took about a week for the budget to reflect well over a hundred-thousand-trillion budget surplus. That's with only a minority share in Oil production.
When I fully nationalized Oil, Gold, and Bananas, (with the US) it seemed to be counterproductive, as the costs also raised the budget outlay to match or exceed the additional production. But, I didn't try Gold or Bananas alone, so I'm not sure if it was Oil, Gold, or Bananas with high national production costs.
As far as editing, those addresses may slightly fluctuate from game to game, so it's best to modify production first, to identify your country address, and then modify inflation. You can do it all while the game is paused.
Remember, you're searching for a float 4 bytes, exact match. You enter the current production (not percentage) and it should narrow it down within a dozen or a few dozen addresses. Usually the one at or near the top is correct (for production).
Inflation is in decimal format. 4.45 percent inflation is found by searching .0445.
Art Money seems to be easier (more specific) than CoSMOS when it comes to decimals, but I don't exactly do this for a living, so I'm not sure where all the program options are.
Art Money is just annoying with all their shareware nonsense inside the program. But, if you can deal with that, just know that I used that program to identify these addresses.