We both know that this 10 rules cover more grammatical error situations than then majority of the existing rules combined. They produce false positives in situations of compound subjects, but is nice to be warned about this type of inconsistencies.
The false positives appear mostly in XX (dictionary should have it as number or neutral noun) and são (which is a plural verb and a singular noun for sane). I have not excluded verbs from the analysis because there are often issues with verbal consistencies but rules can and will be developed.
Remember that this type of false positives also happen in commercial software solutions.
Those are the kind of rules that the user expects from a very basic grammar checker, so they should be here from day 1. See:
It is easier to work if willingness to create solutions and constructive criticism is presented. Understanding the scope of each rule and pointing out were the issue may lay is also welcome. There is still a lot of basic rules to be implemented and they are long overdue.
PS - This post has been edited. My apologies to Marco for the excessive reaction and I hope to compensate by the late hour post edit and reworked of the rules with the information from the test results where I fixed the most common false positives, working around dictionary issues.