Please add a way to navigate to the split on the left/right/above/below the current one. This should also include the windows.

Assign keyboard shortcuts to splits. E.g. Have Alt-Shift-1 jump to the first one opened, Alt-Shift-2 to the second, etc. You could overlay the numbers when pressing and holding Alt-Shift then.

Moving the current editor into another split should use the same key bindings as those used for navigation (with an additional modifier key).