The easiest way to place or move windows/doors at a given position
from the corner of a room or to middle of a room.

• 
  
• This add-on palette can be always open and dockable,
  like a navigation palette.
• Places new windows/doors at the given position of a room.
• Moves existing windows/doors at the given position of a room
  using pencil tool.
• 
  
• The positioning could be the following:
• a given distance from a corner, or
  middle of a wall section.
• 
  
• OS: Windows, MAC OSX 10.4 or higher.

You can find the Move Window Simple Add-On under the Window menu: