All the questions you have are exactly the reason you should buy SNGPT. If people could do the math in their heads while multitabling, they wouldn't need to buy SNGPT. What it does do is give you a very specific answer as to the value of a particular push/fold situation. Then it makes it easy for you to adjust the variables and see how it changes the answer. Not sure what the calling range is for BB, when you are thinking about pushing from SB? Fine, try all 4 presets, from tight to maniac. See how much difference it makes.

You'll be surprised by a lot of the answers at first, but the more you play with it the easier it is to make the right calls based on "feel" when you are actually playing.

If you play more than 50 $11s a month, I think it's a no-brainer to buy.