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EDIT: My bad, I misread the section I was asking about - please ignore.

Why do you say that it is an option? Pedro Kantor's entry says "If you include Pedro Kantor then all units in your army exchange the Combat Tactics special rule for the Stubborn universal special rule and your Sternguard Veteran squads gain the Hold the Line! special rule detailed below." It just says "exchange," not "may exchange." To me it does not appear optional.

I'm with shirou, the only time it's optional is if you have 2 characters, and then you have to pick to use 1 of them.

In that situation with 2 characters, it doesn't specify when the choice is made like it does with librarians "A space marine librarian has two psychic powers (chosen when the army is picked)"

Given that that does not appear again I would say you can make the choice any time before a model is deployed