@Riot: consider renaming "Intentionally feeding" to something more generic.
One of the old labels was, if I remember correctly, "assisting the enemy team". It's far more generic and better suited than "Intentionally feeding".
What should I do about people saying "open mid" and not dying, but not trying to win? What should I do about people saying in /all chat "they are doing baron now, you're welcome". Currently, I just check "Intentionally feeding" then explain in the text area what actually happened, but it's clunky.
Also, even if the word "intentional" was prominently added, people still tend to report you just if you lose your lane, because you're "feeding". I do believe that "assisting the enemy team" would remove part of this nonsense.
Thank you :)