I'd love to see something that allows for better organisation of Sheet and Design Layers. I would envisage this as being a system of folders that can be collapsed and expanded.
For example, we am working on a huge landscape design project which utilises a lot of different types of stone (think of a very complex pattern of setts, cobbles and sawn stone) across a project with four different areas (main garden, roof terrace, drive etc. etc.). It's got plan drawings, setting out details,