Actually the whole idea of the GLUT machine (dubbed the 'blockhead' in Braddon-Mitchell's and Jackson's book, The Philosophy of Mind and Cognition) IS precisely to use live intelligent humans to store an intelligent response to every response a judge might make under a pre-specified limit (including silence and looping, which is discussed explicitly in the paper). The idea is to show that even though the resulting machine has the capacity to emit an intelligent response to any comment within the finite specified limits, it nonetheless has the intelligence...
There is an aspect of the construction that you are not quite taking in. The programmers give a response to EVERY sequence of letters and spaces that a judge COULD type in the remaining segment of the original hour. One or more of those sequences will be a description of a laser, another will be a description of some similar device that goes counter to physical law, etc. The programmers are supposed to respond to each string as an intelligent person would respond. Here is the relevant part of the description: "Suppose the interrogator goes first, ... (read more)