Hello guys, got my micro SD full with games on exfat, also got a USB stick. Can i use retroarch over USB fat32 formatted as second storage option?

Probably would be a great ideaI'm working on it.
However it will not happen until at least the next libnx release, since the actual hooks to use the switch as a usb host only just got added into the development branch.
I think it might technically be possible on SX OS though.