What you're describing are what I call "features" .. anything in the rules that enhances scoring for a particular area, shot or time period.
"Modes" are what I call a set of similar features, all started and qualified with the same shot(s), and usually timed.
Lady Justice is a feature. The ladder of stuff up Tron's playfield are features. The ladder of 5 features up Iron Maiden's playfield are modes.