It would be cool to be able to add new export options to C3 via plugins.
The simple idea would be to be able to write an addon that creates a new export options in the export pannel.
In the addon SDK, I'd be able to either attach myself at the end of an already existing export option, and be able to write some aditional code to make the option compatible with a new platform.
This would also make custom build servers for C3 much easier as we'd be able to have the addon do any processing needed before automatically pushing the game to a store or a website.
Having tools to automate all of that would be a godsend for a lot of people, especially in professional industries like mobile games or web marketing.