with the flexibilty of Popper you can run any all emulators. I use Popper on my MAMECab with any/all emulators currenlty out.

sample start script

START "" "[STARTDIR]Launch\VPXSTARTER.exe" 2 2 10 "Multiple Arcade Machine Emulator"

g:

cd "G:\Emulators\MAME"

START "" "mamelayplus.exe" "[GAMEFULLNAME]"

sample close

"[STARTDIR]LAUNCH\PUPCLOSER.EXE" PROC "mamelayplus" 3 1

For RetroArch sample, on the ROMS Folder option you put your default coreDLL to use. If you have a game that you wish to use as a different coreDLL then you can put that in ALTEXE field.

Sample RetroArch Launch

START "" "[STARTDIR]Launch\VPXSTARTER.exe" 5 1 30 "RetroArch*"

cd /d "[DIREMU]"

rem  ****  set default RetroArch Core DLL Here ****
rem  can override with altexe on game record

SET CORE=[DIRROM]

if "[ALTEXE]" NEQ "" (SET CORE=[ALTEXE])

START "" retroarch.exe -L cores\%CORE%  "[GAMEFULLNAME]"

Default Close

"[STARTDIR]LAUNCH\PUPCLOSER.EXE" WINTIT "RetroArch" 5 1

Amiga Launch Script

START "" "[STARTDIR]Launch\VPXSTARTER.exe" 5 1 30 "WinUAE*"
cd /d "[DIREMU]"
START /min "" winuae64.exe "[GAMEFULLNAME]"

Amiga Close Script

"[STARTDIR]LAUNCH\PUPCLOSER.EXE" PROC "WINUAE64" 5 1

To use joystick to move around in Popper front end you'll need to add JoyAxisMove=1 in custom options. I've tested the basic=zero delay and xb360 controller and older directx style joysticks with no issues.