Configuration file might be found after first launch, and xemu is at /root/.local/share/xemu/xemu/xemu.toml
You may collect video resource from random computer actions and semantically indexed, but better be partially guided by LLM, since that makes more sense even inside a small video excerpt.
Downloading games from Romsfun is fast.
Steam deck has done a lot of things to port PC games to Linux. Most works are around Proton, a Wine fork which supports DirectX features.
EmuDeck has a list of supported emulators.
Many games can be downloaded for emulators, and played on various platforms.
Arch Wiki contains a section around gamepad.
Keyboard can handle all gamepad functions, no mouse required.
It turned out that I hate emulators. I do not want to download separate games and set them up just for random inputs. If that is the case, we should make it much more convenient and error resistant.
I do not want to buy a physical console like Xbox Series S along with a strange HID to gamepad adaptor. It will not accelerate the development of cybergod.