Can we get an in game report system?

I don't like that idea, and frankly I think you didn't really sit down and think through what you're asking for. The last thing we need is more people screwing around and fiddling with reporting people instead of actually playing the game. The current post-game reporting option handles every case you bring up except making a game "refunded, or quit-able" which is a concept that flat-out would not work.

The game is more than just your team so to disband a whole match because you think somebody is "trolling" denies the enemy team their win, and I'm assuming you would want this deployed in ranked so they would also lose their LP for the match and time they invested. Finally, you have to accept the abuse case scenario(s) as being lesser than the good the system could do, which is not the case for your suggestion. Losing a match on your promos? Just have your team report somebody and disband the match, ez.

The only way around the above and other extremely abusive scenarios is to have a player support team actively filter and confirm every in-game report from your system. Do you think Riot has the manpower to do that? Further, do you believe that utilizing said manpower for filtering reports from your proposed system is more valuable than the present system, which already serves its purpose without any additional manpower?

Next is the time, money, and manpower you'd need to build, test, and deploy your system. You'd need new UI assets in-game, new menus, and new metrics to capture the "snapshot of data" that you state is needed for your system as well as a full new utility for the above player support team to analyze the data, otherwise what is the point of capturing it?

In summation: Your system has a ton of flaws, a terrifying abuse scenario, would require a massive investment of resources, and brings almost nothing to the table that the existing post-game doesn't.

{quoted}

ideally u would just hit tab and click a button next to the players name so time is not wasted.

Sounds simple in theory. It may take only a few seconds to drop, click, and go. But that's the same amount of time it takes someone to gank you, too.

Again, there's nothing wrong with the current format. It's after the game is over and doesn't impact gameplay. All we have to do is remember who we are reporting and why.