I actually liked this idea but I don't think we need it here, for example on ALTT doesn't have a feedback or trust system like we (BTT) have, so what they do is deduct all of the karmas of spammers
It's really necessary to compare this forum with Altcoinstalks when you want to propose something? you need to know if Altcoinstalks is a copycat forum of Bitcointalk, not the other way around.
Let's say it is implemented then I could just use it to demote your accounts or demerit your accounts if it is about implementing demerit button.
Don't worry, user who have de-merit isn't only one random user, the de-merited user can create a thread against the sender and if the sender is abusing de-merit, many users will meriting the de-merited user and there's a chance they would de-merit you.