From what other students have told me, NSU students don't have a say in when they are going to do the mandatory rural rotations; it's assigned to them. I think you can try to change schedules with another student though, although I imagine that would not be an easy switch to make. The impression I'm getting from reading these forums and asking NSU students questions is that if you're going to do primary care the whole rural rotation occurring during audition rotation season isn't too big of a deal (since you've already covered your bases in the core clinical rotations and it's not too competitive), but if you're interested in something outside of primary care, it could be. I myself would like to go back to CA for residency, and I'm thinking it would be in my best interest to do electives out there in order to obtain a CA residency. If the rural rotations fall during audition rotation season, it could be a problem.
Someone tell me if I'm wrong here lol. You can also check the NSU 2011-2012 thread for more info.