Isn't that [(ie. simultaneous turns MP)] the default?
Yes, but if playing a single player game in multiplayer mode, I would highly recommend turning simultaneous turns off.
Set options to quick combat
Make sure to enable Quick Moves as well, it saves a ton of animation time.
I'm so used to the option that I almost didn't think of it.
This significantly dropped my time--the sound effects tell you who won or lost, so I use quick combat for my offense and attacking 20 units in a city becomes a 10-second affair or less.
I tend to leave combat animation on for defense just so I can see the order of attacks and process what is happening. Never felt the need to turn it off.
Exit the game before going to bed.
For really quick games, try an OCC. Even with my mad micromanagement the game still takes under 2 hours.