I've posted this idea to AUGI a couple of times but it never gained traction. Perhaps it is better suited for Civil work so I'll try it here.
In civil work we often need to create plans that require multiple layouts that share common viewport display settings. For example a roadway plan may have many plan and profile sheets with all the sheets displaying the same information but in different locations along the roadway. Since all these sheets need to have common viewport display settings (i.e. color, lineweight, layer on/off display, etc.) it can be a tedious process to synchronize all the layouts if a change in the viewports is made. Currently the process requires creating a saved layer state and then stepping through each sheet to apply the new settings.
My idea is to have what I call "viewport styles" where a layer state can be created and associated to viewports. Then whenever the layer state changes, all the viewports with that style assigned to them will update automatically.
I would think this would be useful in other disciplines as well but I couldn't find a generic Autocad Idea Station.