Hi Jacobo, yup it's possible to do do a quick meshing preview on a keyboard shortcut by setting up a keyboard shortcut that does an export to a dummy file name, that's given to the SaveAs command as a command parameter.

Since that gives SaveAs the file name it avoids popping up the file dialog and goes directly to the meshing dialog and then you just cancel out from there (either Cancel button or press the Esc key) after looking at the meshing and adjusting anything.

See here for more details:
http://moi3d.com/forum/index.php?webtag=MOI&msg=4453.6

If you do this a lot, set it on the space bar for super quick access.
To do that for the left-colum key part put in:     Space
and for the command part put in:     SaveAs c:\test.obj

- Michael