Here is version 2.3.1 of the Sx05RE Add-on
There has been a few changes, but the most important is gamepad auto configuration for ES and Retroarch (still trying to figure out Advmame, PPSSPPSDL and Reicast) when you first set up your gamepad in Emulationstation it will also set up your gamepad in Retroarch with hotkeys and all!
(HK = Hotkey)
HK+Start - Quit to ES
HK+X - Retroarch Menu
HK+RB - Save state
HK+LB - Load state
HK+Dpad Left/Right - Select save slot
HK+B - Reset
Remember this add-on might still have issues, if you find any, please don hesitate to let me know
https://discourse.coreelec.org/t/sx05re-retro-emulation-kodi-addon-for-coreelec-released-for-testing/
v2.3.1...shantigilbert:addon_v2.3.1
EDIT: if you downloaded this add-on before this note was present, you need to re-download it as it had a minor bug.