Even if development team takes this feature, you will sit a long time for it to be done. Last recalbox release took ten months or so..
You could try asking at batocera, they usually release every two months. Or stick to retropie. Or maybe recalbox developers will shorten release periods, who knows..
@mantics If you want to have something stable while waiting, then go for batocera. It is not so cool like recalbox but at least it is stable with pi3+ since a couple of releases. I think recalbox stable release for pi3+ will probably still take some time. Or if you want to help with the recalbox beta, then you are more than welcome to send here every bug you find 