I'm still trying to figure out what all the admin buttons are for.
judging by the pictures, of the 15, 8 are likely to be coin and start buttons per player. 3 look like action buttons for the spinner (likely mouse 1,2 and 3 buttons) so that leaves 4. The standard pause, enter, quit, and
![Huh ???](http://newforum.arcadecontrols.com/Smileys/default/huh.gif)