FAAB Question

Last year was my first year playing in a FAAB league. I really liked the idea, but one thing really bugged me. The rosters locked after the bidding period had passed. I’ve heard the guys talk about a second window on Sunday morning but I’m sure I love that option either. I like the tinker with my roster during the week. So my question, is there a setting for FAAB leagues that once the bids are over, that players can be picked up as FA’s? I was playing around with the settings (yahoo) and I’m not sure how to do it. What’s everyone else’s preferences for FAAB? Just looking for some ideas for my league. Thanks for any help/suggestions!