Let's start from the beginning ^^
The issue of Macintosh computers not recognizing Pocketbook's unplugging is something which has been reported by some, so you'll probably get some help. I use Windows, so I can't be of help there.
1. 15.1 was a quite unstable firmware for many, myself included. 15.2 was rock-stable for some, but not for everyone. However, the former firmware version, 14.2, is the golden standard which doesn't hang at all for anyone. Whatever version you choose, I recommend you to change as soon as possible.
2 +3. The wrist-powered page-turning is one of the many feature of FBReader180, which is not the standard FBReader software, but a third party modification, officially unsupported by Pocketbook, but loved by the users (and PB itself). To install it in your Mac, you have to follow the instructions of the thread which is located in this subforum.
4. Aside of installing FBReader180 for more customisation capacities, I would just recommend you to honor the purpose of the thing and read until it bleeds... or your eyes do
