@SimonC The Core will only be changed IF at some point another Retroarch core proves to be superior in general, but it is better not to create expectations.
Read this:
I will try myself to dig into the config files to edit the core options.
See if this helps:
https://forum.recalbox.com/topic/22694/recalbox-7-pc-psx-gc-hyper-lent/4I don't have an Odroid (I only have an Rpi3), so unfortunately I can't help testing it, but maybe some other user can give some feedback here.
You can also try the official Discord, to maybe get feedback from other people and maybe even from the developers (if you speak in French the chances increase even more):
https://discord.com/invite/NbQFbGM