There isn't any softroot with version 1.5 published. There are only beta versiond out, which should only be installed by technically skilled people. There's a reason why you don't find anything with 1.5 at
http://nookdevs.com/Softroot
Btw: the nookDevs library supports folders and tags, that's superior to the B&N approach. So you won't find shelves in the nooksdevs library, but in the stock library.