Is a student-submitted resume suggested? How/when/where?
A student-submitted resume is fine if you just have soooooo many activities/awards/extracurriculars to list that they just don't fit on the Common App section. If that is the case, note "see attached resume" and don't fill in that section. Application readers don't have much time, so don't waste it by making them re-read information stated elsewhere. That said, make sure that you aren't listing minutia that doesn't belong in the application anyway. If you are just trying to "pad" the file, don't go there, they will see right through that. It never hurts to have a resume ready to go. Create one now and it will be easy to just update it as your life proceeds.