I'm one of those that likes moving parts on prop guns too.
Must be the kid in me. What's funny is I've had non SW fans pick up one of my lightsabers, press on assorted buttons and parts and ask "Does it work?" :lol I think that when you have a realistic looking prop, you pretty much want it to have moving parts for that "It may not really work, but it sure as hell looks like it should.." feeling. 