Ok thanks for the explanations.

Be able to interrupt the meshing is indeed a more elegant method that what I was thinking.
and thanks for the shortcut, so simple :o)

For the #4, yes I can imagine it would be a really draft model ... maybe an 'hidden' command is enough I'm
not sure many people would be interested by exporting an ugly models. As I said it's just
to have a quickly preview of 'complex' object in my renderengine ... where I do care more about proportion,
volumes etc that perfect smoothing shape ...

But again if I can abort the meshing command and put some high angle option, it would be cool enough.
(or maybe be able to add arguments to the command, like SaveAs c:\test.obj -Output triangles -Angle 50 -Avoid smaller 4)

Cheers.