Often you'll want to change certain settings in your RDP files, or during configuration of RemoteApp, VDI or otherwise. I just noticed that finally the RDP Custom Settings reference has released at http://technet.microsoft.com/en-us/library/ff393699(WS.10).aspx 

Includes reference details for the following:

  • Administrative session
  • Alternate full address
  • Audiocapturemode
  • Audiomode
  • Audioqualitymode
  • Authentication level
  • Autoreconnection enabled
  • Autoreconnect max retries
  • Bitmapcachepersistenable
  • Compression
  • Desktopheight
  • Desktopwidth
  • Devicestoredirect
  • Disable ctrl+alt+del
  • Disableprinterredirection
  • Disableclipboardredirection
  • Displayconnectionbar
  • Domain
  • Enablecredsspsupport
  • Full address
  • Keyboardhook
  • Load balance info
  • Negotiate security layer
  • Pinconnectionbar
  • Prompt for credentials on client
  • Redirectclipboard
  • Redirectcomports
  • Redirectdrives
  • Redirectprinters
  • Redirectsmartcards
  • Screen mode ID
  • Server port
  • Session bpp
  • Smart sizing
  • Span monitors
  • Username
  • Use multimon
  • Videoplaybackmode
  • Winposstr
  • Workspace id