Desktop Remote Assistance

Use Windows Help and Support.

EDIT:  Just re-read the question.  My reply won't work.  It depends on what you are wanting to do to the end users computer as to what you would use.

We want to be able to use it as any 3rd party dameware/VNC capability using remote assistance.

I am confused.  Are you wanting to take control of the users session and perform tasks OR perform tasks in the background while the user continues to work?

If you are using Remote Assistance to connect to a remote user's session then you are stuck logged in as a (presumably) non-administrative user.

BUT, then what you can do is right-click things and launch them as an administrator.  I tend to launch the command prompt as an administrator and then do things from in there.  The way I usually do this is Start - Run - Cmd  to quickly open one as the current user and then in that prompt type this:
runas /user:administrator cmd.exe
Then I enter the password and that opens me an administrative command prompt from which I can launch whatever I need - eg compmgmt.msc, sysdm.cpl.
And if I need to get at the filesystem then I use  \\<hostname>\c$   and enter admin credentials again and now I can copy things around the filesystem at will.