command line - switch to administrator mode

Solution 1:

Or from within Powershell:

Start-Process powershell -Verb runas

Solution 2:

The answer is no. The "full administrative token" is associated with an .EXE when it's launched. You need to start a new CMD.EXE to get full-admin privs. To make UAC a bit more bearable, you can enable "auto-admin approval" through group policy.