The list of parameters for a method or procedure. In Java, for example, the name of a method is not the complete identifier for the actual code because there may be more than one method with that name but a different set of parameters, e.g. name(first,last) versus name(first,middle,last) may both be methods that return a name string. Only one of them considers using a middle name or initial. So there are 2 different signatures for the method called name.
typical election year scare tactics. This is how you build your war chest. You send up a bill that scares a particular interest group and they end up running around bribing congressmen to kill the bill.
another possible answer for why these ideas were not implemented during his tenure:
He was told what to do and didn't have any options. Maybe the politicians were directing the TSA and telling them what to do and how to do it.