Which games use the Color/B&W switch for game functionality? I don't recall running across any aside from Starmaster. And maybe Space Shuttle?
Here's a list of the games mentioned in the thread, for future reference:
Beany Bopper (pause function)
Bump 'n' Jump (background music on/off)
Cosmic Ark [later version] (disables 'background stars' effect)
Fast Eddie (pause function)
Ghost Manor (selects protagonist's gender)
Journey Escape (turn star field effect on/off)