I just bought my parking and transponder for the M, O, N, and P lots this week.
I know that in the summer, after a certain time (5 I believe?) I could move my car closer to campus and park near the nursing building, near DBAC, or near the fields.

Is it still the same during the school year? I want to be able to go to the gym in the afternoon and the M lot is quite a hike.

Never heard that, but doesn't mean it's not true...

With a transponder for the West campus lots, you can park on any gated lot on campus except the Stadium and Divinity College lots, between 7:30 PM and 7:30 AM on weekdays, and all day on weekends.