Sters -- You are voicing a common concern but it's one that you don't need to worry about. Use Year and the ability to use points or make reservations are not related. You just need to follow the 11/7 month rule for that and know that you can't use more than 3 years' worth of points in any one 12 month period.
The Use Year months are: February, March, April, June, August, September, October and December.
Sters, per your example: If I have a February Use Year I have to use my points between Feb 1 and Jan. 31. I want to stay in a GV in November 2005. In December, 2004 I call and make a reservation. I'm using my Feb 1, 2004-January 31, 2005 points. I previously banked my Feb. 1, 2003-January 31, 2004 points and I will borrow some of m Feb. 1, 2006-Jan. 31, 2007 points. Use Year doesn't matter for making the reservation.