I wanted to know what the button mapping was for volume up/down, and found the Simulator manual, available here: Playdate Simulator - Playdate Help
Lots of good stuff there! Never knew there was a full screen mode, or that you could double click the crank weel 
Thanks! I didn't know about the double-click until now either. I did know about full screen... I often tested my Playtime clocks by running them for hours in full-contrast black-and-white on my 27" display. Pretty cool looking—pixels the size of bathroom tiles!
(Another handy trick: option-click the Save Screenshot button to copy it to clipboard instead.)