Substitutes and Forfeits and how to deal with them

So last week i had to of had the worst luck. I picked up a few players from NRG who were gonna have BIG week against Echo Fox and Bam 0 points for the first game! Followed by I put my money on Ren to have Freeze start and they sub him out for the entire week! Please create something to help us deal with these last minute changes that are really affecting our fantasy points! Maybe giving a default amount of points for forfeits and subs based on how the sub did.