Question: How to drag windows to another workspace from the "Spread view"?

EDIT: Seems to have created some misunderstandings by using the term "Spread View". I am referring to SUPER + W " Spread windows view" and not to SUPER + S "Spread worksheet view" aka "Workspace Switcher".

Answer: 
From the *spread view* (`SUPER` + `S`) just grab the window and drop it on another workspace.

P.S.: It seems as though there was a slight misunderstanding with what you regarded as the *spread view*. You can always hold down `SUPER` to see all Unity shortcuts and their effects in a nifty overview.
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> Disclaimer: This answer refers CCSM (`compiz-config-settings-manager`) which should be used with care. There is a probability of locking yourself out of Unity if handled improperly.
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`Super` + `W` spreads all windows in the current workspace. I assume that is what you are referring to.

It is possible to bind these events to keyboard shortcuts or mouse clicks (with or without modifiers) Left click selects a window and can not be changed as far as I know.

* Zoom into a window, but do not select it
* Close a window
* Pull window

These features are handled by Scale Addons plugin in CCSM. The plugin does have an option to bind a shortcut to `pull Window`. Probably that does what you want. Screenshots are provided below for reference.

![CCSM scale](https://i.stack.imgur.com/RQxy8.png)

![CCSM Scale Addons](https://i.stack.imgur.com/j2zWH.png)

The problem is, I haven't yet figured how to spread all windows from all workspaces. No combination worked, yet. You can try various combinations in Scale plugin to see if you can achieve this. Once you spread all windows from all workspaces, the shortcut assigned to `Pull window` should do the trick.