The editing capabilities of Impress in support of producing a slideshow seem
pretty good.  The actual display of the slideshow capabilities lacks some
important features.  Most of this is related to Powerpoint capabilities that
need to be duplicated.  Also, some enhancements that would be clearly superior
to PPT are suggested.

(1) During display of a slideshow, it should be possible to display a 'Hidden'
slide, typically by pressing H during the showing of the slide immediately prior
to the hidden slide.

(2) Hyperlinks embedded in a slide should be active, allowing jumping to (a) a
specific slide within the presentation or (b) jumping to a new presentation. 
Action selectable to be either click or mouseover.  In the case of (b),
finishing the new presentation or hitting escape should return user to the slide
from which the jump was made.

(3) Display support for second monitor in two monitor systems.  Select ability
to show slideshow on 2nd monitor while edit page is still shown on first monitor.  
         (3a) Unlike PPT, any presentation called by the active presentation
should inherit the display property of the first.  That is, if the primary
presentation is being shown on the second screen, any presentation called by it
should also show on the second screen.  (PPT always defaults a presentation to
the primary sceen.  When showing a presentation on the secondary screen, if it
calls another presentation, that one shows on the primary screen.  Stupid,
stupid, stupid.  But, I digress.)

         (3b)  A capability that does not at all exist in PPT but would be
extremely valuable:  In a two screen system, there should be a mode where the
primary screen is showing something like the slide sorter view (slide
thumbnails) and the secondary screen is showing the fullscreen slides.  The
slide being shown would also be highlighted in the thumbnail view.  Pressing
page down, etc, would change the projected slide as normal and also change which
slide was highlighted on the thumbnail view on the primary screen.  Clicking a
thumbnail would cause that slide to be projected.  This would provide a random
access projection capability which would compete with much of the church worship
software on the market for showing slideshows during worship services.