Just for the record, you can represent counters using a field widget via its .text or .data attributes, or alternatively you could use a slider widget via its .value attribute. Sliders are slightly more convenient than fields for representing numeric values within a known range, since their .value is always a number and is automatically "clamped".
Widgets set to "Show None" behave identically to visible widgets from a scripting perspective; they "remember" their contents across events and when the deck is saved. If there are any widgets whose contents you don't want preserved, you can mark them as Volatile. Sometimes volatile widgets are useful for "resetting" the state of a game.
Does that help clarify?
