@Riot Question about reporting?

What category are you supposed to report someone who intentionally leaves the game or afks in base? I know there is a category for "Leaving the game/AFK", but I always use that category for people who legitimately dc for reasons out of their control. It's my opinion that leaving a game intentionally is a much, much more severe offense than someone having some technical difficulties.

So when I report someone for disconnecting I always report them for "Griefing: Assisting enemy team" if it's intentionally leaving and "Leaving the game/AFK" if it just seems to be a random dc.

What is the official viewpoint of this? I don't think griefers that rage and afk belong in the same category as someone randomly dcing. What am I supposed to do?