I think I'm confusing things here, but after reading that this JB has SDK compliance, I had assumed that also meant I could use the iTunes Rental feature because they might have shared the same encryption methods.

After having a go myself I run into the error of iTunes telling me that it cannot connect to the iTunes store after it has transferred the file over. I've transferred it back and forth on my Nano so I know its not an issue with iTunes or my connectivity.

I'm on an activated phone, and did not have any problems synching after performing the soft jb.

I did not run the new syncfix.sh file that has been recently posted since I am not experiencing problems with regards to mail, calendar, or contacts. Would this however affect my Rentals in some way?