I'm working on a project with a multi-tiered space on a single floor of a building, modeled in revit as several levels approximately 18" apart from one another. This introduces a problem where in order to separate the rooms on each tier from the rooms on the tier above or below there needs to be an identical instance of a room separator boundary in plan, one for each tier. (Because of conditions below it can't be done where all separator boundaries are on the bottom most level.) Working in plan it becomes impossible to tell what room separator boundary is on what level, and the properties palette doesn't display any information to that effect.
I would propose adding a parameter to the properties palette to display the work plane/level the room separator boundary is attached to. This would resolve the inability to tell what level a given room separator boundary is on in plan view.
A better solution to my problem in particular might be to give room separator boundaries a 3D property, making them work more like walls with a top and bottom constraint. Then they become room separator planes, and they can more easily divide rooms in multilevel spaces.