I agree with Kerry's intent, but I would prefer absolutely no special Canadian conditions, as then we sign ourselves for documentation maintenance in the future. Aside from the start time thing, is there anything else we could need?
And for the start time thing, I believe Egidijus is on the right track, just let the TD control that. He/she could choose zero time, 60 minutes, or other.
My personal preference is to have no late time whatsoever, start the clock, and when the person runs out of time, it's over like any other loss on time!