I have Pause, Advance, tilde, tab, enter, Load on my CP.
Coin 1 is the IPAC shift button.
Shift Pause is Exit.
Shift Advance is Reset.
Shift Load is Save.
I don't like to have admin functions assigned to the joysticks or player buttons. I do like having the the quit and reset functions shifted because it makes it harder to do by accident.
I have found that I really don't need to have dedicated buttons for tilde, tab and enter anymore. I don't use tab anymore for configuring the inputs because I use the ctrlr files instead. If I need to alter other settings, I can just pull out the keyboard.