You can modify the CQLinq rule body this way:
// <Name>Methods with too many parameters</Name>
warnif count > 0 from m in JustMyCode.Methods
.WithFullNameNotIn("MyNamespace.MyType.MyMethod1(String,Int32,Int32,Boolean,String,Int32,Int32,Boolean,String,Int32,Int32,Boolean)",
"MyNamespace.MyType.MyMethod2(String,Int32,Int32,Boolean,String,Int32,Int32,Boolean,String,Int32,Int32,Boolean)",
...)
where
m.NbParameters > 5
orderby m.NbParameters descending
select new { m, m.NbParameters }
Notice that the rule body contains the method(s) to exclude full names. To get the method full name, just right click the method in the result and choose the menu Copy name to clipboard.
Alternatively, if you wish to suppress a method from all rules results, you can use the JustMyCode/notmycode facility.