For development of multiboot software, it'd be absolutely lovely to be able to start the PC version of mGBA with both a ROM in the game pak slot and a multiboot image running. It's possible to do this through the “Replace ROM…” option after booting a multiboot image, but as it requires some manual interaction, it's not entirely suited to rapid prototyping.
My suggestion would be to either add a positional argument (e.g. mgba actually_running.mb plugged_in.gba) or a “plug in but don't run” option (e.g. mgba --inserted plugged_in.gba actually_running.mb), but the specific implementation isn't particularly important.
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