I doubt that there is a way to do this, but I'll ask anyway. Is there a way to add a player to your roster on Yahoo and send them straight to the DL? The only way I'm aware of is to drop a guy, add the DL player, switch them to the DL, and then add another player.
12 Team, 5X5 Roto League
C-Martin, 1B-Howard, 2B-Weeks, 3B-Zimmerman, SS-Gonzalez, OF-Hamilton/Bourn/Heyward, Util - D Lee/P Fielder