I'm guessing so I have no idea if this is true or not, but I think if someone has a grudge against another, they can make a bunch of accounts or have friends / members just constantly report an account.
All the evidence discovered will have to be linked in order to make the report complete so there will be no room for making false reports due to grudges and it mods won't have to dig around.
I think the trust rating is an adequate form of what you suggest.
Not for offenses like ban evasion
However, for the time being it would be advised to report a post of those that are ban evading (ideally a post which is posting outside meta and is unrelated to their ban), and include any information that is relevant, as well as the essential evidence.
Thanks, this will help, i was looking for away to report without having to open a topic in meta or reputation over and over again