A governor does a few things. mainly: if you enslave a city, slaves get distributed to cities with a gov (great way to increase citysize quickly -> important for better buildings and taxes). Secondly he has a happyness bonus and publicorder and trade bonus. This is good. Also, a governor provides you with at least one decent unit for defence. You do NOT need a gov in smaller cities.
Garison works as under civ 3 in Monarchy. The more the happier. It does not matter which unit it is.
1 Huge army is not my best bet. Especially Rebel states are easily beaten with a small army. so Split up 70-30. One for your main enemy, one for getting cities quickly.
Spies: I do not get your comment. If a spy has 40% oddds you only know if he succeeds if you open the attack screen. Spies are great, and not so slow IMO.
A unit CAN drop the ram, just select it and click abandon siege eq.
You roman "allies" will become your enemies but in the spirit of teh game I do let them do their part. I have notices that mainly the scipii AI is horrible and cannot beat Carthage... IMO: Julii should get everything between Gibraltar and Russia.
