Presenter video express on macbookpro : format issue

Hi,

Apparently it is not possible to switch to the standard mp4 format (1280x720) in Presenter Video Express when working on Macbookpro. Am I right ?
I can't switch it from the capture preferences ... Incredible !
Any help ?
Or is it one of the many strong limitations of this software ?

Many thanks in advance !

All the best,

Bruno