More than one 'Open xxxxx here as Administrator'

Next registry hack works for directories on Windows 8.1:

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Directory\shell\runas]
"HasLUAShield"=""
@="CMD here as administrator"

[HKEY_CLASSES_ROOT\Directory\shell\runas\command]
@="cmd.exe /S /K pushd \"%V\""
"DelegateExecute"=""

[HKEY_CLASSES_ROOT\Directory\shell\runasPowerShell]
"HasLUAShield"=""
@="PowerShell here as administrator"

[HKEY_CLASSES_ROOT\Directory\shell\runasPowerShell\command]
@="Powershell Start-Process PowerShell -verb runas -ArgumentList '-noexit', 'Push-Location -literalPath ''\"%V\"'''"
"DelegateExecute"=""

You could add analogous runas and runasPowerShell subkeys for drives under the [HKEY_CLASSES_ROOT\Drive\shell] as well.