Hi, in the retroarch.cfg, any line beginning with a ‘#’ is commented out. You need to remove the # to enable the setting. Regarding save states, I don’t think imame4all supports save states but i’m sure mame4all-pi does (I don’t have my Pi at the moment so I can’t check) You can install mame4all-pi via the setup script:

cd RetroPie-Setup
sudo ./retropie_setup.sh

Option 4 “Update RetroPie setup script”

restart RetroPie setup script then

Option 2 “Source based installation”

There should be an option in there to install mame4all-pi.
More info in this thread: https://www.petrockblock.com/forums/topic/mame-confusion-why-multiple-versions/

Hope this helps