Sometimes I suspect that my unhandled reports are duplicates of other members' reports that were resolved before mine arrived. Is there a way for the system to indicate which post has been reported so that duplicate reports on the same post are avoided?
I think that when several members report an identical post and when it is resolved, all reports get the same tag (good/bad) or remain unresolved. I think someone already mentioned this idea to avoid multiple reports on the same posts, but you can never know the exact reason why someone before you reported some post - is it because of spam, referral link/hidden advertising, or something else.
There is also the question of whether such a warning would be publicly visible or would be displayed exclusively in the report window - with the fact that the first would probably be a bad option because anyone who saw that his post was reported could edit or delete it before the moderators did their job.
Regarding your proposal, I would suggest that signatures be automatically turned off on all posts after 5 pages, because that is more than enough to discuss something constructively, and everything after that is just a repetition of the same ideas and attitudes. However, I think that the biggest responsibility lies with the campaign managers who pay for posts in mega threads, and this only motivates spammers to use such an option even more.