I somewhat like the idea that anyone can create a flag after creating a scam accusation thread searching support for the claims. It's a clear and clean thing that can be followed.

But my question is, a flag can be supported only for:
a single case
of a contract breach
flagged by the victim
or is it broader?

Judging from what theymos wrote it sounds like it's intended only the victim can flag? Also contract means a deal between two parties? If it means the forum rules then it would be way broader and include admin work.

Let's use this feature right from the start, I'm sure it will be beneficial.

Also, will there be some form of pm showing the flags of the day or so in order to raise awareness of the flags? Might be a good thing if a broader mass of members is checking.