You could add the ability for the teams with BYEs to score in both weeks and be able to choose the higher of the two weeks...
I think I'd prefer the option, before week 14, of choosing to "start" the week 13 performance of a player instead of week 14.
If your player goes off like Decker, Gordon, Jeffery, etc. It's an easy choice and a true advantage. The strategy becomes interesting if you have guys like Tom Brady - do you take his 371/2/1 performance or hope for better? It's a big advantage for the 1 or 2 seed, but they'd kick themselves if they chose wrong and lost because of it.
Just to use my playoff team with a 1 seed as an example, I'd go with something like:
Week 13 Manning, Peyton DEN QB - 41 pts
Mendenhall, Rashard ARI RB - tough choice here, but I might lock in his 7 pts
Green, A.J. CIN WR - probably week 14 but passing on 5/83/1 would be a tough choice
Week 13 Jeffery, Alshon CHI WR - 54 pts
Sanders, Emmanuel PIT WR - or do I use Andre Holmes week 13 20 pts?
Gates, Antonio SDC TE - week 14
Week 13 Sturgis, Caleb MIA PK - 11 pts
Buccaneers, Tampa Bay TBB Def - week 14
It might not be as much fun as I thought, as I'd possibly be only using Gates and the Bucs D from week 14 with 152 points locked in. Also might be too much of an advantage.