We hear all of you, and understand your concerns. In fact, I raised this issue with the rest of the team several times (as Trix would attest to), and rest assured, we know that you'd all like more examples. I agree that our 0.1.2/4 launch could've really done with more details on how to use new features; I was responsible for organizing the launch, but due to real-life circumstances I was unavailable at the time.
For future launches, we'll try and get everything together - we've formulated a release process that ensures that documentation and examples will be ready prior to release. A bare-bones version of Trix's missiles have been released - the version demonstrated in the video wasn't ready for release - and I hope people will put it to use. Amphibious cars is indeed implemented by placing a clientside static object under the vehicle; that was my script, but as a result of the aforementioned real-life circumstances, I was unable to release it.
So again, sorry for not getting everything together; real life has served to intervene heavily in our affairs, and it's becoming increasingly difficult to fit JC2-MP into our busy schedules. Hopefully, we'll be able to get the next release together in a package everyone can enjoy.