1. The modification directory structure is everything inside a directory of the add on ID, under the library directory. Correct? If so, how come everything under the sun I do with code Listeners tend to result in a "Please add a valid callback method" error.
2. I'm writing an add on to take values from a registering user, check them against a database, and reject/accept the registration. But, I'm going into seriously new territory (MVC). And I don't see a code event listener that'd be used to modify this particular area? Just a quick nudge would be helpful.