In russian Operation Star there are two options:
1. Smoothness
2. Integral Antialiasing
Yes
If I understand this good, the second options gives AA effect, and the first something like "Depth of field" effect.
No.
Other gives AA effect, but second gives side effect in the form of motion blur (when moving camera or object), it's not a DOF
In Patch#7 (october 2011) second will be obsolete, first is improved
I write about this, because I like very much this DOF effect, it gives a nice movie feeling to the game
In english version already fixed. like wiil be in patch #7 for russian version.
Sorry, it's a negative side effect.