Here's my thoughts and ideas on it:
1. I think it could be possible, but might be more hassle than it's worth.
2. I think we need Medals, with different ranks in the medals. Halomods has a system like this, and they have over 83,000 members. It works so that if you stand out in some way, and a mod thinks that you are deserving of a medal, then he can give you one. That way you don't get better things on how many times you post.
For instance, if you make a mold that is OK, then you could get a low level "Molder" medal. If you were to mold a full suit of very high quality armor, then you could get a high level "Molder" Medal.
If you were to make some OK pepakura files, then you could get a low level "Pep Creator" medal. If you were to make some very good or innovative pep files, then you could get a high level "Pep Creator" medal.
You could a "Critic" medal, or anything you could think of. There could also be bad medals, such as the "Bad Grammar" medal. You could then redeem yourself from that by using good grammar.
That is just what I think. If it's to much hassle, ok. If it gets used, I'll be happy.