(harassing players that "feed" to go afk).
Wouldnt work. People are selfish in LoL, it'd be like a 1/10 chance to find someone whod take one for the team.
(side note: i feel like if ur team surrenders 4-1, the 1 should lose half lp because it wasnt his decision to quit. this is irrelevant to the topic, but since we were talking about lp loss...)
Then you mines well just get rid of the surrender option if you do that. Surrender is there for a reason, if your team doesnt know how to group, or someone is feeding on purpose, then you surrender. But if that player that is feeding 0/20 says no to the surrender, he loses half lp... Thats fair.