1. I couldn't afford an STI setup and I don't like bar end shifters. So I used a accessory mount to install an old handlebar. The shifters are mounted on this bar along with the headlight. This allows me to keep my hands on the brake levers while shifting. It isn't perfect, but it works.
2. I zip tied a small hollow tube to the rack. I slide the lock in and it holds it in place. It works surprisingly well.