Hello, good choice of bike! =)

1. Haven't heard anyone who have tried it, but I'm intrigued.

2. It has a cut-out switch but I haven't had any problems with it.

3. GPS rox.

4. That would be illegal here in Sweden so no, but removing the whole plastic blob back there with something lighter and tougher is a good idea. But as you say you want to make it your bike experiment a little.