Just finished my first game (not campaign) on "challenging", which actually wasn't very challenging, to say the least. Game is really good, enjoyable, deep etc, but in some serious lack of polish imo.

Now for my questions:
1. how do you merge two stacks without moving the units from one stack to another one by one?
2. how do you select all of your garrisoned units in a city (in order to move them out for example)?
3. at some point during my end-game, my cities started producing units very very quickly (knights with maces in 2 turns for example). Not just the most teched of them, but even the most "primitive" and non teched one (without any buildings of army producing bonuses for example), and a few turns earlier it took them like 20 turns to produce a more primitive unit. How is that possible, and what could possibly cause that to happen?
4. what is the preferred way for making gold besides killing random bandits?
5. where can i find the tech tree?
6. does the game include some espionage feature like in galciv2?

lastly i want to thank stardock for this wonderful game.