To All:
Let's illustrate the absurdity of ding's little fit -- calling imaginary time a "gimmick" (not an actual argument, shows no actual understanding, is a cheap fallacy in lieu of either) -- and why such concepts are useful and essential to our understanding and description of our reality.
First off, consider the imaginary number i. This is the square root of negative one. Without this concept, you would not be reading this sentence right now. There would be no transistors. There would be no nuclear power, and no x-ray machines in hospitals. The fundamental equation of quantum mechanics -- Schröedinger's equation -- contains an imaginary number:
In the case of a boundless universe, time would also be boundless. Enter: imaginary time, a concept already very useful in both general relativity and quantum mechanics. One elegant solution to maintain a boundless universe and resolve the problem of a singularity involves using imaginary time. This solution is perfectly consistent and, therefore, has not been ruled out.
No, ding is not going to rule it out by having a tantrum on the floor.