I think the new layout options will be very useful. One thing I’d like to see is an option to turn off the ghosted “due” and “defer” in every empty date cell. I’d like to see them only when a row or cell is active. Maybe they could also be shown for the very first list entry as a kind of column header.
Furthermore I’d like to toggle the context/project sidebar independently of the perspective tabs - I think this will become more useful now that you offer a more horizontally oriented layout option. When I work inside my custom perspectives, I rarely change the set of selected contexts, so I’d rather use the space for my task list and have a more focussed interface. On the other hand, I switch between different perspectives quite frequently, which is why I’d like to keep the perspective tabs open. Right now, it’s all or nothing because these two very different things are tied together.