Newbie with a couple of questions (exposure check and sequence adjustments)

For 1 you can use the Frame and Focus module. These images are not automatically saved so if you want them saved you'll need to tick the option to do so:

http://mainsequencesoftware.com/Content/SGPHelp/FrameandFocus1.html

Yes, for unfinished and in progress events just click the ^ arrow to add more frames to that event. You can also add events and targets on the fly.

Thanks,
Jared