Idea on fixing AFK problem
After a teammate has been AFK/Dc problem for 10 minutes (total time) and is currently AFK/DC, your team can surrender for a 1/2 loss (lose half LP and does not count as a loss if in promos). The person who is AFK takes a full loss. Furthermore, you can now surrender earlier than 20 minutes if the conditions are met. Enemy team gets all the benefits of winning.
Thoughts?
Edit 1: If the team loses instead of surrendering, they take a full loss. The half loss can only happen before 30/inhib turrets fall, to prevent abuse.