Your modelbinding plugin looks like it handles form-model binding really elegantly. Any intention of packaging it as a gem as well? I've been using the backbone-rails gem and modelbinding would go nicely with that..
I thought about that when I first wrote it but decided not to, because it's not a ruby app. The backbone-rails gem provides some convenience generators and other things... but I'm not sure I see the value in packaging the modelbinding plugin as a gem. Is there a specific reason you would like to see that?
Sorry for the late reply. I personally like having gem wrappers as it makes installation, upgrading, checking for upgrades, and removal easier. These are all just little things, but they add up over many plugins.