I know with S2 Pro, you can use google checkout, does this affect conditionals, packages or dripping? am I still able to create buttons for custom packages and such, just like I can with paypal in the free version?
Yes, the Google button is pretty much like the PayPal one, what changes is the checkout part since you go to Google instead of PayPal. You'll notice that the button generators have pretty much the same options. Also, your conditionals, packages, dripping are not checking your gateway at any moment, just the access (level, ccap) they got.