I think what you experiment is just the AI improving with the patches. Pocus has done some great job on the AGEOD games AI
But you can low the difficulty and AI aggressiveness on the options menu.
Regarding the fog of war... no sure if the no fog option affects both human and AI or only human...
Sorry, but i don't understand your number 1 question.. what do you mean with "see all the units at once"??