Perhaps you would want to not depend on Rooms Manager for that particular automation? I like that app a lot, but I see it more as a ‘state’ indicator than as a trigger of actions.
My kitchen is being rebuilt right now. I’m integrating Hue light strips under the counters, along with Hue color bulbs in high hat fixtures.
The automation I’m imagining will likely be in Webcore. Any time between, say, 10p and 6a, if the hallway motion sensor senses motion it will put the kitchen into “nightlight” mode for five minutes. That would likely be dim setting of the two high hats on the sink/fridge side of the room. If the dining room/kitchen motion sensor then picks up motion between those hours, it would shift the room into “midnight snack” mode - which would make the under-counter light strips come on bright enough to make a sandwich or something.