It seems that a new rating system is inevitable. I do believe it's important to integrate the previous scores, though. The old feedback tally is nice but it would be better to include it w/the new system. If I had Excel and knew how to use it I would have already volunteered to help, really.
I think this suggestion has already been made but I'll repeat it anyway. After a certain period of time lock the old feedback tally option then the mods could confirm the scores listed using the old threads. This may seem like a lot of work but I don't think everybody that has traded will use the "old feedback tally" option so that will cut down on the amount of research. If the people CheapyD listed plus a few more are the only ones who use it, it shouldn't be too difficult. I would be willing to help w/this if requested to.
As far as the new rating system I think the unique user system is a bad idea. The score should reflect each trade, not user. Part of my current score is based on more than 1 trade w/1 person. A unique user system would essentially penalize you for establishing a rapport w/someone and making multiple trades w/them, at least as I understand it. I strongly vote for a rating based on the individual transaction, not user. If my viewpoint is flawed, feel free to try to persuade me otherwise.
As far as the new rating system I think the unique user system is a bad idea. The score should reflect each trade, not user. Part of my current score is based on more than 1 trade w/1 person. A unique user system would essentially penalize you for establishing a rapport w/someone and making multiple trades w/them, at least as I understand it. I strongly vote for a rating based on the individual transaction, not user. If my viewpoint is flawed, feel free to try to persuade me otherwise.