Had someone threaten to AFK in Lobby and then did in game

But we weren't allowed to remake the game since he technically connected. We lost the game, some lost promos, others just LP. How is there no way to detect someone just sitting in the fountain? I remember a game I used to play where you would be booted for being AFK if you didn't engage in any form of combat for a certain amount of time. But here if you want to afk just randomly click somewhere when the afk timer pops up. Is there REALLY no way to change this?
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