I would change the part about merit and encourage signatures managers to check out the merit background of their users, as well as their last 20 publications. This is really easy to detect here on the forum merit-farmers if you take a look of their profiles and check out their merit, for they are usually shameless and give merits from an account to another almost every day.
Checking the post history of a single account is much easier than cross-referencing multiple accounts in order to spot Merit-related issues, but I agree, I would be the better solution. Many of those who do this are also already tagged for Merit cheating.