Please consider an option to use CoffeeScript code rather than only JavaScript. It could be as simple as leveraging something like this: http://js2coffee.org/.
For folks that do their development in CS, constantly translating back and forth to JS to use Architect is really a pain. I wouldn't even care if you didn't compile the CS to JS somehow, since watching a CS folder and automatically creating JS files is built right into CS, so it is trivial for me to handle that.
Allowing CS should be very easy and would give you a significant product differentiator as well.