Add feature to setup automatic changes IF player is deemed out
Last minute injury updates can kill the fantasy experience. I can't tell you how many games I have lost because I had an important player ruled out right before a game starts and I either don't see it or I don't get to my app before the players lock.
I would like to see a feature added that allows me to set backup players if a player is deemed out. This could be reset weekly or possibly be something that stays week to week. If you have a handcuff RB then you may want to say if Mixon is changed to out then swap in Samaje Perine automatically. Or I may want to come in each week and say if Keenan Allen is out then I want to have Rondale Moore swapped in this week and then next week I may want Joshua Palmer. Or if they're in the flex spot, if allen is out then put in a flex RB or TE. Or even if this player is deemed out then select the highest projected player on my bench. This would thoroughly increase my enjoyment with Fantasy Football and would lock me into your app since no other FF app does this. I spend so much time during the week managing my roster and on Sunday morning I'm almost never in front of my computer or I just want to be able to sleep in that day without worrying about injury designations.
An even more powerful setup (that you should charge for) would be to set things up like "if PlayerX is out then I want PlayerY to be replaced with PlayerZ". For instance, if a teams amazing QB is deemed out then I may know my WR on that team will likely have much fewer points than hoped for, or I may want to start my RB instead because when that QB is out this team tends to rely on the RBs.
Let me do all of my research and team building and team management and then let me enjoy game day without franticly looking at injury reports.

We do have the Start Active Players tool that will move bench players to your starting lineup if the starter is injured. We also have the Start Optimal Players tool that you can get if you purchase Fantasy Plus where it will do the exact same thing, but it will set your lineup based on projections. So, it's a bit of an upgrade. To learn more about the Start Active Players tool, follow this link: https://help.yahoo.com/kb/start-active-players-option-fantasy-sports-sln28660.html