I agree with Lawrence here, you would require a client for it to work, and most people would not be able to install this, for various reasons.
I also think that this plugin would cause compatibility issues with our current chest protection plugin,
It is a good idea, but it would just cause problems, therefore I highly doubt it will be added.
Also the video spotlight's say that this is a mod, not a plugin, so it could not be used on a SMP Server