Better nautilus spatial mode

Nautilus spatial is a very user friendly way to navigate files, however, it
creates window clutter for users who use deep folder trees. I think a discussion
needs to be made on how to improve the spatial mode, especially when we start
considering all the controversies created by
https://bugzilla.ubuntu.com/show_bug.cgi?id=8516

Here is my suggestion of a new spatial behaviour:

A folder will be automatically minimized when the user opens one of its
subfolders for the first time.

If the *very next* action performed by the user *on the autominimized folder* is
to bring it up again, then a flag will be set to tell nautilus not to
autominimize it the next time.

That folder will not be minimized the next time the user opens a subfolder from
that folder.

If the *very next* action performed by the user on *that particular parent
window* this time is to minimize it, then the flag will be deleted and the
folder will be autominimized the next time.

This suggestion, however, will not solve the cluttering on the taskbar. So I
want to make another suggestion to the behaviour of the taskbar that goes with
the above suggestion:

Only the non-minimized window will have an explicit entry on the taskbar. In
order to access the minimized parent windows, the user should use the path menu,
which can be brought up by clicking on the path button on the bottom left corner
of the folder window, or by clicking and hold the taskbar entry for more than
one second (similar to how the tool button groups work in Adobe Photoshop).

ps. My description of the feature might be worded poorly, so please free to ask
me to clarify my wording.