I am a fire officer and the main developer for the BlenderFDS addon to Blender (http://www.blenderfds.org), an open user interface for the NIST Fire Dynamics Simulator.
It can take a lot of time to export Blender geometry to FDS input file (2 or 3 minutes). During this time the Blender interface freezes and the user has no clue of what is going on.
1 - Is there something like Blender 2.4 Window.WaitCursor for Blender 2.5?
2 - Is it possible to use the progress indicator in addons (like that used during rendering operations)? How?
3 - If the previous questions have no answer, how can I notify the user that she just has to wait while Blender is working?