I'm sure auto saving screenies will be supported (as in I think), but you can also do it with other programs, or Xfire even. Or manually (which may help you with some of your other games too).
1. Start your favorite graphics program.
2. Once your graphics program has opened, start your game.
3. Start playing the game.
4. When you get to scene you want to take a screenshot of hit the PRTSCN button. This button is usually near the scroll lock.
5. Use the ALT - TAB command to switch to your graphics program.
6. Press CTRL - V at the same time to paste your screenshot into your graphics program.
7. You know have a screenshot of your game. Make sure to save it under a file name and directory you will remember.
8. Many times screenshots are very large, it is useful to resize the screenshot. This will reduce the file size depending on the amount of resizing you do.