When you're hanging upside-down on a Screaming Squirrel you're experiencing -1G. It's the same force feeling you'd get on one of Skyrush's-1G hills. The reason Skyrush's hill 'feels' more forceful is all those rate-of-change things we've talked about in great length before.
Semantics.I thought Skyrush pulled -2G's on the second hill?
You could, but the shape of the element to go from -0.5G to -1G would look like this (train shown both normal and inverted through the element):So why couldn't you do that but with a small bump in the upside down section to get to -0.5g to -1g? It seems like it'd be a super weird sensation to have a little hop when you're already upside down.