This probably should have been posted in the beta forum. Oh wait, maybe you haven't been added to it?
1) That's interesting, because for the AI, they can lose all their buildings and still it isn't victory until you destroy all their units capable of attacking.
3) That's probably a good idea to switch it to "Hold for continuous fire" instead of clicking constantly.
5) And by manually, we mean "pause the game and look it up in the manual."
11) You mean the War Factory produced Armour unit? That's probably intentional, because it is not that big a unit, it makes sense that it can only hold 3 units. That said, there's no reason why it should display a capacity of 15 units if it can hold only 3.
12) I had something similar once. It hadn't crashed, but it was taking so long that I thought it had hung, Task Manager said it was not responding so I told it to "end task", and THEN it unfroze. But that was my only near-crash.
17) There is no mana usage as far as I know. It seems everything is cooldown based instead.