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Ok, for the dragging part I would have to come up with something, but theoretically, your desired features are possible. I just need some spare time to implement the layout plugins and come up with a good way to handle keyboard shortcuts in nested splits.

kwin is working on this. They ripped the tiling logic from the core somewhat recently but I believe they either added it back as an addon, or are in the process of doing so. You can email their ML for more info.

i3wm lets you resize both floating and tiled windows via the mouse. You can also decide where the systembar goes.