I load my footage from sd cards directly in Windows without using Premiere. So, since I am not using Premiere to capture audio and video does it matter how I setup my scratch disks for Captured Video & Audio?
Personally I'd break out the RAID 0. I don't consider them necessary unless you're working with Uncompressed HD (and even then a RAID 3 is still the better option). Plus there is the greater risk of data loss with a RAID 0.
So what I'd do is this.
G: Scratch (Previews, Media Cache, etc.)
Use your largest drive for E: and the smallest for C: