@melbmatt50 I thought you already used the configuration editor to set those options ?
Anyway, you can find it in Retropie-Setup, under 'Configuration/tools' - see https://retropie.org.uk/docs/Configuration-Editor/.
You can go into the Advanced Configuration -> Configure Libretro options, choose which core (or all if you want all cores), then in the list choose to configure input_player1_analog_dpad_mode - from there you can configure which joystick (left/right) to control the D-pad.
there is an option to select analog or digital in mame2003+ as it supports analog 2003 doesnt just go to your options and change you controller setting to digital.
it sin options->control mapping change it to digital and it will work for snes pads and arcade sticks ect with having to set all the inputs. The majority of people want real analog controls when available so thats the default.
@dudleydes "Select" eventually inserts a coin for all roms. However, I have to push a bunch of buttons first before "Select" inserts a coin. I've experimented to see if I need only to wait a certain amount of time, or hit a certain button before Select, however I haven't found any specific requirement other than hitting a bunch of buttons. And this happens for all roms, mspacman.zip, frogger.zip, mappy.zip, dkong.zip, and so on.
It's off topic but fun to mention-- I modified the dkong.zip ROM so that Pauline is the one climbing the ladders to save Mario rather than the other way around. It's pretty cool that it actually worked (i.e., I didn't figure out how to do it, but found a process for doing it on the web).