One can add screen movies recorded with fgrab to FastCut movie projects. Firstly, setting in and out point is done with the fvf_player helper application that launches by double-clicking the FVF file in the Finder. In the preferences set the movie width and height to the dimensions of your screen. The actual output export size may be set later in the QuickTime export dialog. Also make sure that the framerate in the preferences dialog is set to the framerate of your fvf clip or higher. A double-click on the FVF clip in the timeline opens the fvf_player to set in or out points (among other things) again.