I have seen many architectural firms use the curtain wall tool to create wall cladding systems for metal panels and such. This is fits in with the double/split exterior wall modelling method where you create a back-up/base wall (such as steel stud or CIP Concrete) then you create a separate wall assembly for the cladding (from membrane outwards to the finish cladding material). It allows for cleaner connections/joins and more construction accurate modelling.
What revit needs is a dedicated wall cladding tool that is based off the curtain wall tool. Give it the ability to control the reveals/panel ends; whether a stacked pattern, running, or random. Have each panel separate parameters that could allow for varying depths on a instance basis (in addition to a type based panel depth). Then what would separate this tool would be the interactions with doors and windows, try to let them interact like they do with a traditional revit wall. Another neat feature that could be useful would be allowing it to be hosted to the backup/insulation wall assembly so that if that moves or is altered it would directly affect the cladding wall.
In regard to the reveals/panel joints (and this is something that should be added to the curtain wall tool) would be the ability to add extra grid lines at varying angles and even lengths.
