The OP is offering to contest negative ratings the recipient feels is unjust, which has the potential to expose negative ratings given out for less than kosher reasons.
I would say any recipient of unjust negative trust has a better capability to contest the negative rating themselves. Including digaran would be counter-productive in this regard.
I agree,
in most cases, it will be best to contest a negative rating yourself. However there are cases when this is not true, for example if you do not speak english very well, or if you are having trouble articulating an argument.
Exposing unjust ratings is not something to be regulated by a commissioned 3rd party; that is a community effort.
I would not say the type of service the OP is offering is regulating the contesting of unjust ratings in any way, the recipient is free to contest the rating himself.
Also on your point this being a community effort, I would agree, however I would also say the community has failed in this regard. The instances of cases in which contested ratings are really even discussed are few and far between. Most of the time, conversations about contested ratings both start and finish with "xx doesn't trust you, therefore the negative rating is valid" which in no way is looking into the legitimacy of the underlying rating.
The fact that someone is a shit poster is handled by the merit system, and handled by the fact that they will get banned if they post too much nonsense.
Not entirely handled, though, is it? I would say that some sort of assistance or augmentation is appropriate, such as tagging people you believe to be untrustworthy for maliciously spamming.
I would disagree. Someone breaking forum rules needs to be dealt with via the administration either themselves or via delegated authority of the moderators. Most instances of rule breaking are dealt with by giving the person some kind of warning -- be it a PM, a post being deleted or a temp ban -- and the person doesn't break the underlying rule again (or they don't after multiple warnings). A negative rating on the other hand is pretty much always going to be longer lasting than any warning, and in most instances will be permanent -- this will result in many people effectively being excluded from the community that probably should not be.
A negative rating would still be appropriate if there was a failed scam attempt, or if someone is showing signs they plan on attempting on scamming someone in the future.
Believing someone is untrustworthy and believing someone is going to scam are not necessarily one in the same. You can believe someone will betray your trust simply because they are unable to understand what would constitute "your trust"; there are endless subjective reasons to distrust someone. All of these are valid, in our system, as it is currently "enforced".
You have a small number of people who leave negative ratings for subjective reasons (that are often questionable), it just appears this is more widespread because of the vast number of ratings they hand out. In my prior post, I provided an example of when I received a negative rating for no reason other than I was calling out a scam attempt someone was engaged in. By the criteria that you can leave a negative rating because you "distrust" someone would mean you can leave a negative rating for someone calling out your scam attempt, and if this is acceptable, then those in the DT network get a free pass in scamming.