I too would like to change the units to pixels, since the output is usually
measured in pixels (that is, projectors and monitors use pixels), so it would
be easier to calculate proportions.
I also use Articulate Presenter with PowerPoint, and when it inserts
objects, it uses pixels for measurement (since it's output is designed to
view on monitors).
If the units can't be changed, I'd appreciate suggestions for working with
the units as they are.