Hello

every one I'm getting ready to build my first control panel and have a few questions regarding the right number of buttons. It's a 4 player unit with four joystick and each player gets 4 buttons.
Beyond those 16 bottons, I have 3 questions:
1) Can I combine the credit button for each player with the player selection button (eg having 4 buttons instead of 8 for that) If it's a good approach, how does it work and is there any drawback to combining them?
2) Beyond those bottons, do I need only 2 more overall (select and exit) or do I need more than that.
3) I am thinking of adding a fifth joystick ( a dedicated 4 way joystick for single Pacman play etc.) Is there a way to have the control panel defaulting to using this joystick when playing PAcman and games like that vs the player 1 8 way joystick?
Thanks a lot. I would like to order my bottons and extra 4 way joystick asap!
Jean