A request for a report tab called defeatist.
For those of you who don't know what a defeatist is they're basically this.
https://theworldaccordingtoalice.files.wordpress.com/2013/03/game-over-man-game-over.jpg
The second anything bad happens they're ready to give up and cause as much non-lethal harm to your team as possible. I would say this falls under unsportsmanlike like conduct but literally everything on the report tab qualifies as that, so I'm assuming that specifics matter when reporting.
I know what you might be thinking.
"Wouldn't a surrender in general mean you're a defeatist?"
Not exactly. Surrendering is through a majority vote, a defeatist is the one guy who refuses to do anything but cry in a corner during a totally winnable fight. A defeatists is the carry that doesn't go to baron despite the majority of the enemy team being dead but the Jungler is still alive so they'd rather not even try. A defeatist is the tank who dodges a nid spear just to let it hit the ADC. A defeatist is the guy who'd rather stay in the fountain despite there being only one enemy attacking your base that they're totally capable of holding off or killing.
The difference between a defeatist and anyone who surrenders is a surrender is an acknowledgment to a failure of play while a defeatist is a saboteur of morale and the worst part is that in their mind, they're in the right. Convincing a defeatist is near impossible but there lack luster effort will only cause the rest of the team to crumble from a lack of morale, which is one of three sections to make the triangle of battle.
Morale, knowledge and the ability to fight. If any of these three are lacking then defeat is assured.
Personally I don't think this should be a report to destroy your LoL account unless you literally get reported for this 100 times in a row. I'd suggest a minor slap on the wrist cooling off ban of about thirty minutes to an hour for anyone whose done this too much and/or a note to tell the player to get a more leveled head when playing LoL.
If a defeatist tab can't be implemented for X reason, can unsportsmanlike conduct atleast receive a defeatist modification?
On a counter note. Even thought I'm the never surrender type, it doesn't mean I don't know when I see a loss. A report for people who're trying to hold players into games because they have the power to is basically holding someones time hostage. They could be losing a game and need to leave but two players would rather burden the person then let them go. The person who has to leave will go AFK and get punished, so adding something to the defeatist tab about this wouldn't be bad thing IMO.
The best contrast to a defeatist I can think of would be a player whose basically won the game but their show boating leads to a defeat.
Something to help stop this can't be awful either.