1. This is a bug, it'll be fixed.
2. Boot time may be shaved a little, but it's mostly limited by the time it takes the HDD to spin up and become ready. Considering I can't even get out of my parking space in 10 seconds, I think it's probably livable with. Seen the boot time of Alpine's in-dash nav/CD changer system?
3. Press DNPP then the preset number you want to store it in. Not obvious, I know.

Hugo