New Company Association Search List

What is the best way to show a complete list of companies from the primary company association panel when in Contact edit mode without having to enter search criteria?
There is a "select company from selector" script on the portal for companies. Can this be modified to show all companies?
Here's the screen I'm working with:
There is a "select company from selector" script on the portal for companies. Can this be modified to show all companies?
Here's the screen I'm working with: