I am sorry you found the forum registration a pain. Actually we get about 20 spam requests for each 1 real member so we use a system where by you apply via the registration page on the forum. We have recently started to sell the debugger option which brings in a small amount of revenue but everything else has been provided free for many years and as such we avoid too much extra work on behalf of spammers
You will read on our site and in the forum that response to visualmicro.com new registration requests has been slightly slowed this month due to some unique factors. It is impossible for us to monitor a large forum such as this for ad-hoc requests which is why we provide the Visual Micro forum. We hope to see your reg request if you have not already made one.
So to answer a few questions...
1) You will see intellisense for all sources including core and libraries. In VS intellisense and the ability to use the class explorers for libraries and core is enhanced if you click "Project>Show all sketch files". This additional option is for more advanced users, does not affect compilation but simply brings the sources from the libraries and core directly into the project. (Click the menu item again to remove the additional sources). Without this option VS or Atmel will perform exactly like the Arduino Ide
2) If you can not see your libraries in the explorer or on the menu item "Project>Add/Import Sketch Library" then the SketchBook Folder path will be wrong in the Visual Micro options. The path should normally be automatically discovered by Visual Micro from your Arduino Ide configuration, however, it has possibly been overridden and is pointing to the wrong location? (or we have a bug that has not been reported but it would be an obvious bug that I would have expected to have been reported by many others)
Do you know how to see and change the Arduino SketchBook folder path in Visual Studio?
Below you can see the config options that specify which version(s) of Arduino you are using, where they are installed and what sketchbook location you optionally want to use. The image shows the config for Arduino 1.0.x apps. You will see there is also an Arduino 1.5.x option available