sorry guys, I can't stand basketball, but I am glad for you and your exams...
Arkansas has dictated that, on an incomplete pass, we are not to signal to stop the clock. This is because "everyone" knows that the clock stops on an incomplete pass. This attitude irritates the snot out of me. I like the incomplete/stop clock combo because, when in the R position, I have a good indication of what just happened down field.
As for the catch, no catch signal, I have used both only once in the last four years. Both times when I had an excellent view on a close play. Neither time did I hear a peep from the coaches. They both thought that if I was that adamant about a call then I must be sure about my call.