Mark, if I understand what you're after, it sounds you should take a look at 
Stephan B. Wessels' "Squeak Development Example for Squeak 3.9" tutorial (URL 
below)

http://squeak.preeminent.org/tut2007/html/

In particular, Section 6 details creating a stand alone, double-clickable 
application (or as close as Squeak can get, depending on OS) which won't 
expose the user to the Squeak development environment.  The previous five 
sections describe developing the application used in section 6.

I believe the mechanism also works in Squeak 3.10, but don't know from 
personal experience, nor do I know if there's any better way.

Hope this helps.