In the manual it says I should have a save game option in the pause menu in campaign mode.

Now From my understanding campaign mode is where you follow the storyline in single player. (correct me if I am wrong here)

I don't see a save option and I am really getting tired of repeating the Jedi Temple level when I mess up and lose the books.

So

Someone tell me how to save.

Press 'Esc'. Save option is in there. You can't save in the middle of a battle, though.

theres also another save related problem, when i change settings for IA such as hero unlock time etc. when i leave the game the settings arent saved?

Yep, no mid-level save, just like the previous game.

Just like there isn't a "Restart Mission" option in Galactic Conquest, it makes it harder

Damn, Guess I just need to practise then

Just save before every battle. Just quit and load it up again if it's obvious that you're going to lose.

Right. It's annoying, but it works. And don't just use one save, use multiples.

Just quit and load it up again if it's obvious that you're going to lose.
You might as well finish out the battle, it doesn't matter if you lose, but you gain experence faster when there are overwhelming odds aganist you. Try running/jumping/rolling around the map as much as you can with out getting hit.

Don't forget to let you frendly troops enter the library first. There aren't many enemies spawning at this point in the game so wait until there are a lot of your troops inside. It makes is much easier to defend the book cases.

I can never get many of them in there, I stood around for a good 10 minutes and half my force was still in the main hall of the temple.