Welcome to FXhome!
Which Green Screen Starter Kit are you referring to? Is this from another retailer?
You couldn't easily do stop motion with PhotoKey as it's designed specifically for still images.
There is a photographer's forum here: http://fxhome.com/forums/viewforum.php?f=45
The site is primarily video based as we only introduced the photography line in the last couple of years, while we've been making video software for 10 years. It'd be great to see more photographers around here though!