Of course mafia can click the rolelist, but any town can do that quicker than mafia, and a lot of people don't even know you can do that. It's not technically metagaming so you can't report for it, but it really should be. It's just unfair because you're forcing people to always have the card open for the role they're claiming and if you're on mobile or your browser isn't in fullscreen, you can't do that. There was a game recently where I was mafia that a Doctor was executed because they couldn't post attributes fast enough. That's just unfair to that person and it really ruins games.
You shouldn't be allowed to use things like "Spell X backwards" to prove if someone is being honest in a social deduction game. It's detracts from the gameplay. I think the game would be so much better off if this would be stopped.