Just wanted to share what I do which you may want to consider (if you have room to do so on your panel):

On my panel (not quite finished building it yet) I have an Asteroids layout, that will double as Admin buttons when the shift button is pressed (left flipper will be shift) See pic below. The Asteroids layout is located in the top center of the panel and consists of 5 buttons that control your ship in the game: left, right, hyper space, thrust and fire. While the shift button is pressed, the buttons become: exit game, launch game, favorites, back button (using Maximus Arcade the back button lets you choose which emu you want to play) and reset game.
I have dedicated "1 - 4 player" buttons with credit buttons (lit in the appropriate color for each player) and two "pause" buttons (one on each side of the panel on top - black). I don't consider these admin buttons.
P.S. - My front end is "Maximus Arcade" which I believe supports a screensaver during any inactivity which should include pausing (I have to verify this). You can configure how long the time out period is in the config area in Maximus Arcade. I set mine for 20 minutes. Anyone who pauses longer than that kind of deserves for it to kick out of the game and go to the demo mode (which is how my screensaver is configured - it loads a random game out of the list and demos it for 4 minutes each).
Since I was still working on the control panel, I wasn't sure how I want to label the admin buttons yet. I was thinking I can have something like: Left / Menu Back; Right / Launch Game; Hyper Space / Exit Game; Thrust / Favorite; Fire / Reset Game. I would have the Asteroids commands in Red text and the Admin buttons in White Bold Text. (not sure on colors of text yet).
Either that or I can have something mounted on the inside of the glass/plexi with admin instructions.
Either way, the whole point of this is that the admin buttons would double as an Asteroid layout.
~ DeLuSioNaL