Originally Posted by GrillMaster

This is not accurate. It awards days off first, and then raps in order of preference/availability, so it may or may not be able to get you your first choice. YOU CANNOT always get a specific rap/improve your chances of getting a specific rap, just by not requesting certain days off, thats not how it works. It might help, but too many variables at play (seniority, Bids awarded prior to you, reserve need/grid, coverage awards etc) The PBS guys wont recommend what you suggested, not preferring days off, as it is not a surefire way to get a specific rap.
By not bidding for days off you are not helping yourself. Ask the PBS guys.

But yes, I agree it sucks the way it currently works as days off and raps are not awarded together.