I see that the lr-caprice32 has support for m3u playlists - https://github.com/libretro/libretro-cap32 - so you can create a .m3u file containing each game's disks.
Emulationstation doesn't know - yet - how to handle those files and it will not show them, though. If you use the lr-caprice32, you can create your custom es_systems.cfg - see here) - and add .m3u as known extension.

@MrSkyle Probably use both. Be easier that way.

You'd end up having more entries, but only use the alternate name for games released in that region.

Like:

Addams Family Values - Mega Drive EU

The Addams Family - Genesis US

@dankcushions >the docs are synced to the wiki... at some point.

They should be synced automatically ish. At least much quicker than once a week. :)

Thanks to all :)

For now I'm stick to default ES version. Maybe in future the experimental branch would resolve all it problem.

I will mind the tip!

Thanks to all for responding me, thanks even to you I'm really near to finishing my project :)

@josephchrzempiec no problem.