Creating a copy of your master page that suppresses left menu / quicklaunch

While trying to simply create a SharePoint 2010 master page for a site collection where they simply don't need the quick launch left menus.  This was a great simple guide on how to achieve this.

http://sharepointpromag.com/sharepoint/four-ways-add-or-remove-quick-launch-menu-control

The 4 options were all great.

However, what I ended up doing was a combination of Option 1 and 2.  Which could really be documented as an option 5 approach.

In the site, I disabled the quick launch (Option 1).  This result in it not showing but the area to the left is still a blank block of space.

Then I simply created a copy of the master page that I have been using and called it MyMaster_ForNoLeftMenu

I then also copied our main css file and added 

/* Suppress Left Menu space after turn off Quick Navigation and Tree view at site level settings*/
#s4-leftpanel {
  display:none;
}
.s4-ca {
  margin-left:0px!important;
}

Saved it as myCssNoLeftMenu.css in the Style Library library folder.

In the master page I simply changed the reference to the css registration to the css file with the left hide above

 <SharePoint:CSSRegistration name="/Style Library/css/myCssNoLeftMenu.css" after="corev4.css" runat="server"/>

Now to control this, simply set the site's master page to MyMaster_ForNoLeftMenu after disabling the need to show the quick launch in the site settings.