The Super Famicom shows up as a separate system in the carousel but the ROMs are actually stored within a subdirectory of the SNES ROMs...

@gus_sc I once tried this with launching images, but it created some irritant effects: this will create a strange behavior of the keyboard's Enter key in the emulator, which is especially annoying in MAME's Tab menu: Pressing Enter will either exit the Emulator or do other strange things like running Emulation Station a second time. It seems like another terminal is running in the background that reacts to the keyboard inputs in the running game. See https://retropie.org.uk/forum/topic/24671/loading-rom-completely-while-displaying-launch-image/ for the complete thread about it. Does your method have any such effects?