Have you tried using vertically or horizontally split windows for this? (C-x 3 or C-x 2)
It seems like it would give you fewer steps - even if you implement something like you're talking about.
I find split windows really speed up copy and pasting operations. I use the arrow keys on my num pad to switch among windows (windmove-left, right, up, down), so it's only one key to press and you go to the window you want.
I guess this is a little different from what you're asking for, but it sounds like it might help speed things along a bit.
C-x left and C-x right cycle through buffers, but you have to hit it multiple time, you can't just keep the key pressed down.
For creating a macro for #1, you just start a macro, hit the keys you usually do to create a new buffer, stop the macro.
So it would be something like:
C-x ( C-x b NEW C-x )
You can then save NEW to a file once you're done pasting, so you can use the macro again to create a new buffer. C-x e to try out the macro. If it works you can save it into your init.el file. This is done with:
M-x name-last-kbd-macro
Then you'll get a prompt to enter the name of your choice. This is only good for the current session. Then you save the named macro to your initialization file. First you open your .emacs or init.el file. Then you place the pointer where you want to macro definition to go, then you type:
M-x insert-kbd-macro
Now you can run you macro using its name by M-x macroname . You can bind your macro to keys too (in your .emacs or init.el file:
(global-set-key (kbd "C-c a") 'macroname)
For example this is how your init.el would look after creating a macro that opens a new buffer called NEW that is not associated with a file and binding this macro to C-c n
;; Creates a new unassociated buffer called NEW
(fset 'new-buffer
"\C-xbNEW\C-m");
;; Shortcut for new-buffer
(global-set-key (kbd "C-c n") 'new-buffer)
You can also throw in the paste, buffer close, and buffer switching operations too. I guess you'd have to save the buffer to a file manually.
Macros: http://www.emacswiki.org/emacs/KeyboardMacros
Possibly useful: Swap text between buffers - http://www.gnu.org/software/emacs/elisp/html_node/Swapping-Text.html#Swapping-Text