Level-based parameters in View Filters include "Associated Level"
Having access to a view's Associated Level in View Filters would provide more flexibility in how I show two-level objects. For example, this would allow me to show stairs that have a Top Level at a view's Associated Level, and it would allow me to hide stairs that have a Base Level there as well. This could also be applied to walls, columns and any other two-level families. It may even work for single-level families (which is the majority of families) in parameters that use a Level.
The drop-down for all parameters using Levels as inputs would have the added option "{Associated Level}". I suggest having this in brackets to show it changes based on the view, as opposed to the Levels in a project which remain the same regardless of which view is open.